Power supply device with multiple voltage outputs

Abstract

A power supply device with multiple voltage outputs includes a controller and a first power supply module and a second power supply module connected in parallel. The controller selects a first voltage control signal and a first switch control signal to the first power supply module or a second voltage control signal and a second switch control signal to the second power supply module according to a voltage demand signal. The output power of the first power supply module has a first voltage value selected from a first voltage value set, and the output power of the second power supply module has a second voltage value selected from a second voltage value set. The minimum value of the first voltage value set is greater than the maximum value of the second voltage value set. Thus, a wider voltage output capability is provided while also providing good power conversion efficiency.

Description

Technical Field

[0001] This invention relates to a power supply device, and more particularly to a power supply device with multiple voltage outputs. Background Technology

[0002] With the development of technology, all kinds of electronic devices are constantly being developed and innovated, bringing more functionality and convenience.

[0003] These electronic devices are widely used; nowadays, everyone uses an increasing variety of electronic devices every day, such as mobile phones, smartwatches, Bluetooth headsets, tablets, and laptops. These devices offer a wealth of functions and convenience, but because they require different charging voltages, each needs a corresponding charger. This forces users to prepare or carry multiple chargers. Using and carrying these chargers not only increases overall weight but also makes switching between them inconvenient. Furthermore, due to the different voltage requirements, various chargers are mass-produced, leading to the proliferation of chargers becoming a subject of scrutiny regarding environmental issues. Summary of the Invention

[0004] One object of the present invention is to provide a power supply device with multi-voltage output capability.

[0005] Another objective of this invention is to enable power supply devices with multi-voltage output capability to have good conversion efficiency.

[0006] Another object of the present invention is to enable the power supply device to have a wider range of voltage output types.

[0007] To achieve the above and other objectives, the present invention provides a multi-voltage output power supply device, comprising: a controller, a first power supply module, and a second power supply module. The controller selects to output a first voltage control signal and a first switch control signal, or a second voltage control signal and a second switch control signal, based on a voltage demand signal. The first power supply module has a first power conversion circuit and a first switch. The first power conversion circuit converts an input power supply into a first output power supply according to the first voltage control signal, and the first switch connects the first output power supply to a power line according to the first switch control signal. The second power supply module has a second power conversion circuit and a second switch. The second power conversion circuit converts the input power supply into a second output power supply according to the second voltage control signal, and the second switch connects the second output power supply to the power line according to the second switch control signal. The first power supply module is connected in parallel with the second power supply module. The first output power supply has a corresponding first voltage value, which is selected from a first voltage value group. The second output power supply has a corresponding second voltage value, which is selected from a second voltage value group. The minimum value of the first voltage value group is greater than the maximum value of the second voltage value group.

[0008] According to one embodiment of the present invention, during the period before the voltage demand signal is transmitted to the controller, the controller may disable the first switch control signal to disconnect the first switch and enable the second switch control signal to turn on the second switch.

[0009] According to one embodiment of the present invention, the voltage demand signal has a corresponding demand voltage value. When the demand voltage value is the first voltage value, the controller first enables the first switch control signal to turn on the first switch, and then disables the second switch control signal to turn off the second switch.

[0010] According to one embodiment of the present invention, the second switch has an output terminal connected to a coupling point of the power line, and a first protection unit is provided between the output terminal and the coupling point. The first protection unit is used to block reverse current from the coupling point to the second power supply module.

[0011] According to one embodiment of the present invention, a second protection unit may be provided between the first protection unit and the coupling point, and a control terminal of the second protection unit conducts the grounding path of the second protection unit according to an overvoltage protection signal provided by the controller.

[0012] According to one embodiment of the present invention, the power line is coupled to a connection interface for providing an electrical connection to a load. A third protection unit may be provided between the coupling point and the connection interface. The third protection unit has a resistance matching circuit that adjusts the overall resistance value according to the first voltage control signal. An output terminal of the resistance matching circuit feeds back a detected voltage value on the power line to the controller. The controller selectively generates the overvoltage protection signal according to the detected voltage value.

[0013] According to one embodiment of the present invention, the first voltage value of the first voltage value group may be 20V, 28V, 36V or 48V. The second voltage value of the second voltage value group may be 5V, 9V or 15V.

[0014] According to one embodiment of the present invention, the first power conversion circuit may include a first power converter, a first optocoupler, a shunt regulator, and a selection circuit. The selection circuit generates a voltage selection signal in response to the first voltage control signal. The shunt regulator generates a first feedback signal in response to the first output power and the voltage selection signal. The first optocoupler selectively generates a first enable signal in response to the first feedback signal. The first power converter generates the first output power in response to the first enable signal.

[0015] According to one embodiment of the present invention, the second power conversion circuit may include a second power converter and a second optocoupler, wherein the second optocoupler selectively generates a second enable signal according to the second voltage control signal, and the second power converter generates the second output power according to the second enable signal.

[0016] According to one embodiment of the present invention, the first power converter may be an LLC resonant converter, and the second power converter may be a flyback converter.

[0017] According to one embodiment of the present invention, the controller may be a power delivery controller conforming to the Type C Universal Serial Bus specification.

[0018] Accordingly, by means of two sets of power supply modules connected in parallel under the control of the controller, the power supply device with multiple voltage outputs can provide output power at any voltage value in the first voltage value group or the second voltage value group. This not only provides a wider range of voltage output capabilities, but also provides good power conversion efficiency through the configuration of multiple sets of power supply modules. Attached Figure Description

[0019] Figure 1 This is a functional block diagram of a power supply device with multiple voltage outputs according to an embodiment of the present invention.

[0020] Figure 2This is a functional block diagram of a power supply device with multiple voltage outputs according to another embodiment of the present invention.

[0021] Figure 3 This is a functional block diagram of a multi-voltage output power supply device according to another embodiment of the present invention.

[0022] [Symbol Explanation]

[0023] 100 Power supply unit

[0024] 110 First Power Supply Module

[0025] 111 First power conversion circuit

[0026] 1111 First Power Converter

[0027] 1112 First Optical Coupler

[0028] 1113 Branch Regulator

[0029] 1114 Selection Circuit

[0030] 112 First Switch

[0031] 120 Second Power Supply Module

[0032] 121 Second power conversion circuit

[0033] 1211 Second Power Converter

[0034] 1212 Second Optical Coupler

[0035] 122 Second Switch

[0036] 130 Controller

[0037] 140 connection interface

[0038] 150 power cord

[0039] 161 First Protection Unit

[0040] 162 Second Protection Unit

[0041] 163 Third Protection Unit

[0042] EN1 First power signal

[0043] EN2 Second Energizing Signal

[0044] FB1 First Feedback Signal

[0045] FB11 First output power supply voltage divider signal

[0046] FB21 Second Output Power Supply Voltage Divider Signal

[0047] N1 Output terminal of the second switch

[0048] N2 coupling point

[0049] N3 Second Protection Unit Control Terminal

[0050] Output of N4 resistance matching circuit

[0051] OVP overvoltage protection signal

[0052] P1 First Output Power Supply

[0053] P2 Second Output Power Supply

[0054] SC1 First switch control signal

[0055] SC2 Second Switch Control Signal

[0056] Paths in the resistance matching circuit from v1 to v4

[0057] VC1 First voltage control signal

[0058] VC2 Second Voltage Control Signal

[0059] VE1 Voltage Selection Signal

[0060] VN Voltage Demand Signal

[0061] VS Input Power Detailed Implementation

[0062] To fully understand the purpose, features, and effects of this invention, the invention will be described in detail below with reference to the specific embodiments and accompanying drawings, as follows:

[0063] In this document, the terms "a" or "an" are used to describe units, components, devices, modules, instruments, circuits, or signals. This is used for ease of explanation and to provide a general meaning for the scope of this invention. Therefore, unless it is clearly indicated otherwise, this description should be understood to include one or at least one, and the singular also includes the plural.

[0064] In this document, the terms “comprising,” “including,” “having,” or any other similar terms are not limited to the elements listed herein, but may include other elements not expressly listed but which are generally inherent in the unit, component, device, module, instrument, circuit, or signal.

[0065] In this document, the terms "first" or "second" and similar ordinal numbers are used to distinguish or refer to units, components, devices, modules, components, circuits, or signals that are related to the same or similar entities, and do not necessarily imply a spatial or temporal order of these units, components, devices, modules, components, circuits, or signals. It should be understood that in certain situations or configurations, ordinal numbers may be used interchangeably without affecting the implementation of the invention.

[0066] With the booming development of mobile and wearable electronic devices, users typically own multiple devices simultaneously, each requiring a corresponding power source to charge its internal battery. For these devices, a single power supply that automatically provides the appropriate charging power based on the charging needs of each device would offer a better user experience. Such a power supply operates based on the voltage demand reported by the connected electronic device, adjusting its output voltage to provide the correct charging power.

[0067] Please refer to Figure 1 This is a functional block diagram of a multi-voltage output power supply device according to an embodiment of the present invention. The multi-voltage output power supply device 100 mainly includes: a first power supply module 110, a second power supply module 120, and a controller 130. An electronic device (not shown) serving as a load is connected to the power supply device 100 through a connection interface 140. The controller 130 can obtain a voltage demand signal VN fed back by the corresponding connected electronic device through the connection interface 140, thereby controlling the first power supply module 110 and the second power supply module 120.

[0068] The first power supply module 110 or the second power supply module 120 adjusts an input power source VS (e.g., AC power or other power source) based on the control signal transmitted from the controller 130 to generate the power required by the load. The first power supply module 110 and the second power supply module 120 are configured in parallel within the power supply device 100. In other words, the second power supply module 120 is independent of the first power supply module 110. The power supplied by the second power supply module 120 to the load is derived from and converted from the input power source VS, rather than the power converted by the first power supply module 110.

[0069] When a load is connected to the connection interface 140, the power supply device 100 can first provide a basic power supply to the load through the connection interface 140, allowing the load to perform basic operations based on the basic power supply and generate the voltage demand signal VN for feedback to the power supply device 100. The basic power supply can be derived from the input power supply VS through either the first power supply module 110 or the second power supply module 120.

[0070] The controller 130 can be used to generate a first voltage control signal VC1 and a first switch control signal SC1 to control the first power supply module 110. Furthermore, the controller 130 can also be used to generate a second voltage control signal VC2 and a second switch control signal SC2 to control the second power supply module 120. The controller 130 selectively generates the type of output signal based on the voltage demand signal VN. In this embodiment, the controller 130 is used to output the first voltage control signal VC1 and the first switch control signal SC1, or to output the second voltage control signal VC2 and the second switch control signal SC2.

[0071] The first power supply module 110 includes a first power conversion circuit 111 and a first switch 112. The first switch 112 (e.g., a transistor or other electronic component) is coupled to the first power conversion circuit 111. The first power conversion circuit 111 can be enabled based on a first voltage control signal VC1 to convert the input power supply VS into a first output power supply P1. Furthermore, the first switch 112 can be enabled based on a first switch control signal SC1 to open the power output channel of the first power supply module 110, allowing the first output power supply P1 to be provided to a power rail 150. The power rail 150 is coupled to a connection interface 140, through which the load 200 obtains the first output power supply P1. The first voltage control signal VC1 causes the first output power supply P1 converted by the first power conversion circuit 111 to have a corresponding first voltage value.

[0072] On the other hand, the second power supply module 120 includes a second power conversion circuit 121 and a second switch 122. The second switch 122 (e.g., a transistor or other electronic component) is coupled to the second power conversion circuit 121. The second power conversion circuit 121 can be enabled based on the second voltage control signal VC2 to convert the input power VS into a second output power P2. Furthermore, the second switch 122 can be enabled based on the second switch control signal SC2 to open the power output channel of the second power supply module 120, so that the second output power P2 can be provided to the power line 150. The power line 150 is coupled to the connection interface 140, thereby allowing the load 200 to obtain the second output power P2 via the connection interface 140. The second voltage control signal VC2 causes the second output power P2 converted by the first power conversion circuit 111 to have a corresponding second voltage value.

[0073] In this embodiment, the voltage conversion capabilities of the first power supply module 110 and the second power supply module 120 are configured to be different. In other words, the voltage range of the first output power supply P1 provided by the first power supply module 110 is different from the voltage range of the second output power supply P2 provided by the second power supply module 120. For example, the first voltage corresponding to the first output power supply P1 can be selected from a first voltage value group, and the second voltage corresponding to the second output power supply P2 can be selected from a second voltage value group, wherein the minimum value of the first voltage value group is greater than the maximum value of the second voltage value group.

[0074] By configuring power supply devices according to their different voltage conversion capabilities, each power supply device can operate at a better conversion efficiency. For example, the first voltage value group includes 20V, 28V, 36V, and 48V, and the first voltage value is selected from one of them; and the second voltage value group includes 5V, 9V, and 15V, and the second voltage value is selected from one of them. The first voltage value group and the second voltage value group are defined in different voltage ranges.

[0075] For the aforementioned voltage conversion ranges of 20V, 28V, 36V, and 48V, the corresponding power supply device is preferably a resonant power supply device, such as an inductor-inductor-capacitor resonant transformer (commonly referred to as an LLC resonant transformer) or a push-pull transformer. On the other hand, for the aforementioned voltage conversion ranges of 5V, 9V, and 15V, the corresponding power supply device is preferably a non-resonant power supply device, such as a flyback transformer, a forward transformer, or a buck converter.

[0076] Furthermore, when the voltage range is wider, the number of power supply modules can be increased to cover more voltage ranges, ensuring that the power supply device operates at optimal conversion efficiency within each voltage range. For example, using three parallel power supply modules—an LLC resonant transformer, a step-down converter, and a flyback transformer—can supply voltage conversion ranges of 48V, 15V-20V, and 5V-12V respectively. This concretely implements the configuration of power supply devices based on their different voltage conversion capabilities. What remains constant is that each parallel power supply module operates independently; the power supplied to the load by each module originates from and is converted from the input power VS, not from the power converted by any single power supply module.

[0077] When the electronic device, acting as a load, is connected to the connection interface 140, the controller 130 engages with the electronic device to cause the electronic device to transmit a voltage demand signal VN containing its voltage requirement information to the controller 130. Before the controller 130 receives the voltage demand signal VN, the controller 130 controls a predetermined set of power supply modules to provide a predetermined voltage. For example, before the controller 130 receives the voltage demand signal VN, the controller 130 disables the first switch control signal SC1 to disconnect the first switch 112 and enables the second switch control signal SC2 to turn on the second switch 122. The turned-on second switch 122 causes the second power supply module 120 to output a second output power supply P2 with a predetermined voltage. This predetermined voltage is, for example, 5V or other specific voltage values.

[0078] The predetermined voltage enables the electronic device to perform basic operations and interact with the controller 130. When the voltage demand value corresponding to the voltage demand signal VN transmitted by the electronic device exceeds the voltage range that the second power supply module 120 can provide, in terms of switch control, the controller 130 first enables the first switch control signal SC1 to conduct the first switch 112, and then disables the second switch control signal SC2 to disconnect the second switch 122. For example, when the voltage demand value corresponding to the voltage demand signal VN belongs to one of the voltage values ​​in the first voltage value group, the controller 130 switches the power supply source in the aforementioned operating mode.

[0079] Please refer to Figure 2 This is a functional block diagram of a multi-voltage output power supply device according to another embodiment of the present invention. Each power conversion circuit has corresponding circuit components. For example, by using power conversion circuits with different power conversion characteristics, the power supply device 100 can have both multi-voltage output capability and good power conversion efficiency.

[0080] In this embodiment, the first power conversion circuit 111 includes a first power converter 1111, a first optocoupler 1112, a shunt regulator 1113, and a selection circuit 1114. The second power conversion circuit 121 includes a second power converter 1211 and a second optocoupler 1212. The optocoupler is used to feedback the difference between the output voltage of the power conversion circuit and the required target voltage, and to provide isolation between the power converter and the control loop.

[0081] In the first power conversion circuit 111, the selection circuit 1114 generates a voltage selection signal VE1 corresponding to a first voltage control signal VC1 from the controller 130. For example, the selection circuit 1114 and the controller 130 communicate via a general-purpose input / output (GPIO) interface. For instance, the controller 130 has multiple sets of GPIO interfaces connected to the selection circuit 1114, each corresponding to the same number of voltage control commands. For example, the controller 130 has four sets of GPIO interfaces connected to the selection circuit 1114, each set corresponding to a first voltage value, such as 20V, 28V, 36V, or 48V. For another example, when the controller 130 wants the first power conversion circuit 111 to generate a 20V output voltage as the first output power supply P1, it transmits the first voltage control signal VC1 through the GPIO connection interface corresponding to 20V. Accordingly, the GPIO connection interface corresponding to the selection circuit 1114 will receive the first voltage control signal VC1 and generate a voltage selection signal VE1 corresponding to 20V.

[0082] The shunt regulator 1113 is a voltage regulation device used to determine the target voltage value of the first output power supply P1 output by the first power converter 1111. The shunt regulator 1113 is coupled between the selection circuit 1114 and the first optocoupler 1112, receiving the divided voltage output by the first power converter 1111 and the voltage selection signal VE1. The shunt regulator 1113 controls the first optocoupler 1112 via a first feedback signal FB1, causing the first optocoupler 1112 to selectively generate the first enable signal EN1, thereby enabling the first power converter 1111 to adjust the voltage value of the first output power supply P1 based on the first enable signal EN1.

[0083] For example, the shunt regulator 1113 can achieve voltage regulation through an operational amplifier and a switching element coupled to the operational amplifier. The operational amplifier compares the divided voltage of the first output power supply P1 with a voltage selection signal VE1, which is associated with the voltage value information required by the electronic device. Therefore, when the voltage signal value of the divided voltage of the first output power supply P1 is higher than the voltage signal value of the voltage selection signal VE1, the operational amplifier draws in a first current. This first current pulls down the gate voltage of the switching element (e.g., a transistor) to a voltage level below its threshold, thereby disconnecting the switching element and keeping the subsequent first optocoupler 1112 disconnected.

[0084] Conversely, when the voltage divider signal FB11 of the first output power supply P1 is lower than the voltage signal value of the voltage selection signal VE1, the operational amplifier draws a second current lower than the first current. This second current is a lower quiescent current. This second current keeps the gate voltage of the switching element above its threshold value, thereby turning on the switching element and causing the shunt regulator 1113 to generate an output as the first feedback signal FB1. The first feedback signal FB1 is used to drive the first optocoupler 1112 at the back end and generate the first enable signal EN1.

[0085] In the second power conversion circuit 121, the second voltage control signal VC2 is used to drive the second optocoupler 1212 to generate a second enable signal EN2. The second enable signal EN2 causes the second power converter 1211 to adjust the voltage value of the second output power supply P2. In this embodiment, the controller 130 can be configured to receive a voltage divider signal FB21 from the second output power supply P2, for example, the second power conversion circuit 121 in this embodiment. Under the control of the voltage demand signal VN, when the second power conversion circuit 121 needs to provide output power, the controller 130 compares the required voltage value with the voltage divider signal FB21, thereby generating the second voltage control signal VC2 to control the second optocoupler 1212.

[0086] exist Figure 2 In this example, the first power converter 1111 can be an LLC resonant converter, and the second power converter 1211 can be a flyback converter. The controller 130 can be a power delivery (PD) controller conforming to the USB Type-C standard. Furthermore, the predetermined voltage output by the controller 130 before receiving the voltage demand signal VN is provided by the flyback converter, providing, for example, 5V, for the basic operation of the electronic device to interact with the controller 130.

[0087] Next, please refer to Figure 3 This is a functional block diagram of a power supply device with multiple voltage outputs according to another embodiment of the present invention. Figure 3 The embodiment further includes a first protection unit 161, a second protection unit 162, and a third protection unit 163. These protection units further provide additional protection for the power supply device 100 equipped with multiple power supply modules, particularly considering that the output power supplies of these power supply modules each have different voltage ranges. The protection units 161, 162, and 163 are... Figure 3 In the examples, all systems are configured to use this feature. In other embodiments, one or any two protection units may be used. Figure 3 The example is not a limitation.

[0088] Regarding the first protection unit 161, the second switch 122 has an output terminal N1. The output terminal N1 is connected to a coupling point N2 of the power line 150. The first protection unit 161 is disposed between the output terminal N1 and the coupling point N2. The first protection unit 161 is used to block reverse current from the coupling point N2 towards the second power supply module 120. The first protection unit 161 can be, for example, a diode element.

[0089] Regarding the second protection unit 162, the second protection unit 162 can be provided between the first protection unit 161 and the coupling point N2. A control terminal N3 of the second protection unit 162, based on an overvoltage protection signal OVP provided by the controller 130, connects the ground path of the second protection unit 162, thereby allowing the output power to be released through this ground path and preventing it from being output to the electronic device through the connection interface 140. This is because the controller 130 can obtain the current voltage and current detection values ​​of the power output through the connection interface 140. Figure 3 (Not shown), therefore, the controller 130 can perform basic protective control (disconnection) on the first switch 112 or the second switch 122 in the event of overvoltage. Furthermore, the controller 130 can further enhance protective control by configuring the second protection unit 162. The second protection unit 162, for example... Figure 3 The example demonstrates how a combination of transistors and resistors can form a switching circuit that can be connected to a ground path. The controller 130 can establish a path to control the second protection unit 162 via the aforementioned GPIO connection interface.

[0090] Regarding the third protection unit 163, the power line 150 is coupled to the connection interface 140 for electrical connection of an electronic device, which serves as a load. The third protection unit 163 is disposed and connected between the coupling point N2 and the connection interface 140. The third protection unit 163 has a resistance matching circuit including multiple resistors and multiple transistors. The resistance matching circuit can sense the voltage value on the power line 150 as a detection voltage value, and feed back the detection voltage value to the controller 130 through an output terminal N4.

[0091] The third protection unit 163 serves as a voltage detection circuit for the power line 150. Simultaneously, the controller 130 controls the transistors within the resistance matching circuit to create a matched sensing resistor. This matched sensing resistor means that, under normal power supply conditions, the equivalent resistance of the resistance matching circuit is such that the detected voltage value substantially corresponds to the voltage value corresponding to the voltage demand signal VN (i.e., the controller can determine that there is no overvoltage). Accordingly, the third protection unit 163 can be controlled to provide real-time detection of the power supply status of the first power conversion circuit 111 and provide the detection result (the detected voltage value) to the controller 130.

[0092] The resistance matching circuit can match the corresponding sensing resistance value according to the voltage demand signal VN. Specifically, the resistance matching circuit includes multiple paths v1 to v4, each path corresponding to a matching resistor, and each path, or at least some paths, corresponding to a transistor. The conduction or deactivation of the transistor depends on the control of the controller 130. Furthermore, when the transistor is turned on, the corresponding path in the resistance matching circuit is simultaneously turned on, which makes the corresponding resistor on the conducting path, and the matching sensing resistance is automatically formed, thereby correctly providing the voltage condition on the power line 150 under the current power supply conditions.

[0093] For another example, the third protection unit 163 is suitable for use when the first power conversion circuit 111 is used to provide a large range of voltage values, such as 20V, 28V, 36V, or 48V. Figure 3 As shown in the example, the resistance matching circuit includes four paths. Based on the voltage demand signal VN, the first path v1 is used to provide a matched combination of resistors to correctly sense 20V when the voltage value corresponding to the voltage demand signal VN is 20V (the remaining paths v2 to v4 are open circuits).

[0094] The second path v2 is used when the voltage value corresponding to the voltage demand signal VN is 28V. In this case, the controller 130 provides a signal to turn on the corresponding transistor, so that the second path v2 provides a matching resistor combination (including the resistor in the first path) to have correct sensing capability for 28V (the other paths v3 to v4 are open). At this time, the other transistors are turned off.

[0095] The third path v3 is used when the voltage value corresponding to the voltage demand signal VN is 36V. In this case, the controller 130 provides a signal to turn on the corresponding transistor, so that the third path v3 provides a matching resistor combination (including the resistor under the first path) to have correct sensing capability for 36V (the other paths v2 and v4 are open circuits). At this time, the other transistors are turned off.

[0096] The fourth path v4 is used to provide a signal to turn on the corresponding transistor when the voltage value corresponding to the voltage demand signal VN is 48V. This causes the fourth path v4 to provide a matching resistor combination (including the resistor in the first path) to have correct sensing capability for 48V (the other paths v2 to v3 are open). At this time, the other transistors are turned off.

[0097] Accordingly, the third protection unit 163 can be controlled by the controller 130 to combine the corresponding resistance value based on the voltage demand signal VN, thereby enabling correct voltage sensing of the power line 150. The output terminal N4 can feed back the corresponding detected voltage value to the controller 130, so that the controller 130 can use it as a basis for determining whether to generate the overvoltage protection signal OVP.

[0098] When the second protection unit 162 and the third protection unit 163 are used simultaneously, the overvoltage protection signal OVP is determined based on two sources: one is the voltage and current detection values ​​of the power output obtained by the controller 130 through the connection interface 140; the other is the detection voltage value obtained by the controller 130 from the output terminal N4 of the third protection unit 163. If either of these determinations is abnormal, the controller 130 will generate the overvoltage protection signal OVP to control the second protection unit 162, creating a grounding path to release the abnormal voltage.

[0099] In other embodiments, the control gates of each transistor in the third protection unit 163 can be coupled to the corresponding GPIO connection interface of the controller 130. For example, since each GPIO connection interface can correspond to a first voltage value, such as 20V, 28V, 36V, or 48V, when the controller 130 transmits the corresponding voltage control command to the first power conversion circuit 111 through the GPIO connection interface, it can simultaneously transmit the voltage control command to the corresponding transistor in the third protection unit 163. Accordingly, through the GPIO connection interface, the controller 130 can simultaneously control the first power conversion circuit 111 and the third protection unit 163.

[0100] The aforementioned electronic device serving as a load can be, but is not limited to, the following devices: smart bracelets, mobile phones, tablet computers, laptops, desktop computers, or other forms of computers.

[0101] In summary, the multi-voltage output power supply device disclosed in the embodiments of the present invention provides at least two sets of power supply modules connected in parallel to a power rail, which allows the controller to select the corresponding power supply module according to the voltage demand signal. This not only enables the power supply device to have a wider range of voltage output capabilities, but also provides better power conversion efficiency.

[0102] The present invention has been disclosed above with reference to preferred embodiments. However, those skilled in the art should understand that these embodiments are merely illustrative of the invention and should not be construed as limiting its scope. It should be noted that all variations and substitutions equivalent to these embodiments should be considered within the scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A power supply device of multiple voltage outputs, characterized by, The application comprises: a controller, which can obtain a voltage demand signal fed back by an electronic device corresponding to a connection through a connection interface, and select a first voltage control signal and a first switch control signal or a second voltage control signal and a second switch control signal according to the voltage demand signal; a first power supply module, which has a first power conversion circuit and a first switch, the first power conversion circuit converts an input power into a first output power according to the first voltage control signal, and the first switch connects the first output power to a power line according to the first switch control signal; and a second power supply module, which has a second power conversion circuit and a second switch, the second power conversion circuit converts the input power into a second output power according to the second voltage control signal, and the second switch connects the second output power to the power line according to the second switch control signal; wherein the first power supply module is connected in parallel with the second power supply module, the first output power has a first voltage value selected from a first voltage value group, the second output power has a second voltage value selected from a second voltage value group, and the minimum value of the first voltage value group is greater than the maximum value of the second voltage value group; before the controller receives the voltage demand signal, the controller controls the predetermined first power supply module or the predetermined second power supply module to provide a predetermined voltage, which can enable the electronic device to perform basic operation and handshake with the controller, so that the electronic device transmits the voltage demand signal with voltage demand information to the controller; the voltage demand signal has a demand voltage value, after the controller receives the voltage demand signal, when the demand voltage value exceeds the voltage range that the predetermined first power supply module or the predetermined second power supply module can provide, the controller first enables the non-predetermined first switch control signal to turn on the first switch or first enables the non-predetermined second switch control signal to turn on the second switch, and then disables the predetermined second switch control signal to turn off the second switch or disables the predetermined first switch control signal to turn off the first switch, to switch the first power supply module and the second power supply module.

2. The power supply apparatus of claim 1, wherein During the period when the voltage demand signal has not been transmitted to the controller, the controller disables the first switch control signal to turn off the first switch, and enables the second switch control signal to turn on the second switch.

3. The power supply apparatus of claim 2, wherein When the demand voltage value is the first voltage value, the controller first enables the first switch control signal to turn on the first switch, and then disables the second switch control signal to turn off the second switch.

4. The power supply apparatus of claim 1, wherein The second switch has an output end connected to a coupling point of the power line, a first protection unit is arranged between the output end and the coupling point, and the first protection unit is used to stop reverse current from the coupling point to the second power supply module.

5. The power supply apparatus of claim 4, wherein A second protection unit is disposed between the first protection unit and the coupling point, and a control end of the second protection unit is turned on according to an overvoltage protection signal provided by the controller to turn on a ground path of the second protection unit.

6. The power supply apparatus of claim 5, wherein The power line is coupled to a connection interface for providing a load electrical connection, and a third protection unit is disposed between the coupling point and the connection interface, and the third protection unit has a resistance matching circuit for adjusting the overall resistance value according to the first voltage control signal, and an output end of the resistance matching circuit feeds back a detection voltage value on the power line to the controller, and the controller selectively generates the overvoltage protection signal according to the detection voltage value.

7. The power supply apparatus of claim 1, wherein The first voltage value of the first voltage value group is 20V, 28V, 36V or 48V.

8. The power supply apparatus of claim 1, wherein The second voltage value of the second voltage value group is 5V, 9V or 15V.

9. The power supply device according to any one of claims 1 to 8, wherein The first power conversion circuit has a first power converter, a first optocoupler, a shunt regulator and a selection circuit, the selection circuit correspondingly generates a voltage selection signal according to the first voltage control signal, the shunt regulator generates a first feedback signal according to the first output power and the voltage selection signal, the first optocoupler selectively generates a first enable signal according to the first feedback signal, and the first power converter generates the first output power according to the first enable signal.

10. The power supply device of claim 9, wherein, The second power conversion circuit has a second power converter and a second optocoupler, the second optocoupler selectively generates a second enable signal according to the second voltage control signal, and the second power converter generates the second output power according to the second enable signal.

11. The power supply device of claim 10, wherein, The first power converter is an LLC resonant converter, and the second power converter is a flyback converter.

12. The power supply apparatus of claim 1, wherein The controller is a power delivery controller conforming to the USB-C specification. The controller is a power delivery controller conforming to the USB-C specification.

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