TWI817459B - Power delivery device - Google Patents

Abstract

A power delivery device is provided. The power delivery device supplies a power to an external device. The power delivery device includes an LLC converter, an output blocking switch, a buck module, and a power delivery controller. The LLC converter outputs one of a maximum output voltage and a minimum output voltage. The output blocking switch is coupled between an output terminal and the external device. When a voltage value of a required voltage of the external device is substantially equal to one of a voltage value of the maximum output voltage and a voltage value of the minimum output voltage, the power delivery controller turns on the output blocking switch. When the voltage value of the required voltage is not equal to the voltage value of the maximum output voltage and the voltage value of the minimum output voltage, the power delivery controller turns off the output blocking switch and controls the buck module to provide one of the multiple bucked output voltages to the external device.

Description

power supply device

The present invention relates to a power supply device, and in particular, to a power supply device capable of responding to a variety of different voltage requirements.

As the Power Delivery (PD) version is updated, the same power supply device may have to cope with more different voltage requirements. Because the current maximum power requirement will be greater than the 75 watts defined by Energy Star. Therefore the power factor value must be greater than 0.9. Therefore, the power supply device will be designed as a two-stage architecture, with a boost converter in the front stage and an LLC converter in the rear stage.

LLC converters have the advantages of high conversion efficiency due to their flexible switching characteristics. The LLC converter operates in a variable frequency manner to adjust the voltage gain to achieve a stable voltage output function. Please refer to Figure 1, which is a trend chart of the resonance curve based on the LLC converter. At light load, the LLC converter operates at the resonant frequency f1. At heavy load, the LLC converter operates based on the resonant frequency f2. Therefore, the resonant frequency range of the LLC converter is between the resonant frequency f1 and the resonant frequency f2.

It should be noted that to take into account more different voltage requirements, the gain that current power supply devices can provide must be based on a wider resonant frequency range. In other words, the second resonant frequency f2 must be designed at a lower resonant frequency. However, it is obvious from Figure 1 that if the second resonant frequency f2 continues to decrease, the voltage gain will become lower, resulting in lower output voltage and power. Inadequacy and other issues. Therefore, how to enable the power supply device to meet more different voltage requirements within a limited resonant frequency range is one of the research and development focuses of those skilled in the art.

The present invention provides a power supply device capable of responding to multiple different voltage requirements.

The power supply device of the present invention. The power supply device supplies power to the external device. The power supply device includes LLC converter, output blocking switch, buck module and power supply controller. The LLC converter has an output. The LLC converter outputs one of the maximum output voltage and the minimum output voltage through the output terminal. The output blocking switch is coupled between the output terminal and the power input terminal of the external device. The power supply controller is coupled to the buck module and the output blocking switch. The power supply controller obtains the required voltage of the external device. When the voltage value of the demand voltage is substantially equal to one of the voltage value of the maximum output voltage and the voltage value of the minimum output voltage, the power supply controller turns on the output blocking switch. In addition, when the voltage value of the demand voltage is not equal to the voltage value of the maximum output voltage and the voltage value of the minimum output voltage, the power supply controller turns off the output blocking switch and controls the buck module to reduce the multiple buck outputs according to the maximum output voltage. One of the voltages is supplied to the power input.

Based on the above, when the voltage value of the demand voltage is substantially equal to one of the voltage value of the maximum output voltage and the voltage value of the minimum output voltage, the power supply controller turns on the output blocking switch. Therefore, the LLC converter outputs one of the maximum output voltage as well as the minimum output voltage. When the voltage value of the demand voltage is not equal to the voltage value of the maximum output voltage and the voltage value of the minimum output voltage, the power supply controller turns off the output blocking switch. The buck module provides one of multiple buck output voltages to the power input. Therefore, the LLC converter only provides the maximum output voltage as well as the minimum output voltage. The resonant frequency range of the LLC converter does not need to be amplified. In this way, the power supply device can meet more different voltage requirements within a limited resonant frequency range.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings.

Some embodiments of the present invention will be described in detail with reference to the accompanying drawings. The component symbols cited in the following description will be regarded as the same or similar components when the same component symbols appear in different drawings. These embodiments are only part of the present invention and do not disclose all possible implementations of the present invention. Rather, these embodiments are only examples within the scope of the patent application of the invention.

Please refer to FIG. 2 , which is a schematic diagram of the operation of a power supply device and an external device according to an embodiment of the present invention. The power supply device 100 supplies power to the external device LD. In this embodiment, the external device LD may be an electronic device such as a notebook computer, a tablet computer, a monitor, an external hard drive, a smart phone, a digital camera, etc. In this embodiment, the power supply device 100 includes an LLC converter 110, an output blocking switch QB0, a buck module 120, and a power supply controller 130. LLC converter 110 has an output terminal TO. The LLC converter 110 outputs one of the maximum output voltage Vmax and the minimum output voltage Vmin through the output terminal TO. The output blocking switch QB0 is coupled between the output terminal TO and the power input terminal TP of the external device LD. The power supply controller 130 is coupled to the buck module 120 and the output blocking switch QB0. In this embodiment, the output blocking switch QB0 is implemented by an N-type MOSFET. However, the present invention is not limited to this. The output blocking switch QB0 of the present invention can be implemented by any form of transistor switch, relay, or transmission gate.

In this embodiment, the power supply controller 130 obtains the demand voltage VREQ of the external device LD. The demand voltage VREQ is a voltage signal used to drive the external device LD. For example, the power supply controller 130 is a controller that can support USB Type C and any PD version. The external device LD is an electronic device that can support USB Type C and any PD version. The power supply controller 130 communicates with the external device LD through a configuration channel (CC) of the Universal Serial Bus (USB) to obtain the demand voltage VREQ.

In this embodiment, the power supply controller 130 determines the demand voltage VREQ of the external device LD. When the voltage value of the demand voltage VREQ is substantially equal to one of the voltage value of the maximum output voltage Vmax and the voltage value of the minimum output voltage Vmin, the power supply controller 130 turns on the output blocking switch QB0. Therefore, the LLC converter 110 provides one of the maximum output voltage Vmax and the minimum output voltage Vmin to the power input terminal TP of the external device LD through the output terminal TO and the turned-on output blocking switch QB0. For example, the voltage value of the maximum output voltage Vmax may be the largest voltage value in the PD version (eg, 48 volts). The voltage value of the minimum output voltage Vmin may be the minimum voltage value in the PD version, or the communication voltage value (eg, 5 volts) required when the power supply device 100 is connected to the external device LD. That is to say, in this example, when the power supply device 100 is connected to the external device LD, the LLC converter is controlled to provide the minimum output voltage Vmin.

On the other hand, when the voltage value of the demand voltage VREQ is not equal to the voltage value of the maximum output voltage Vmax and the voltage value of the minimum output voltage Vmin, the power supply controller 130 turns off the output blocking switch QB0 and controls the buck module. 120 for control. Therefore, the buck module 120 provides one of the buck output voltages VBU1 to VBU5 to the power input terminal TP of the external device LD according to the maximum output voltage Vmax.

It is worth mentioning here that when the voltage value of the demand voltage VREQ is substantially equal to one of the voltage value of the maximum output voltage Vmax and the voltage value of the minimum output voltage Vmin, the LLC converter 110 converts the maximum output voltage Vmax and the minimum output voltage One of the voltages Vmin is output to the power input terminal TP. When the voltage value of the demand voltage VREQ is not equal to the voltage value of the maximum output voltage Vmax and the voltage value of the minimum output voltage Vmin, the buck module 120 provides one of the buck output voltages VBU1 to VBU5 to the power input terminal TP. Therefore, the LLC converter 110 is only used to provide the maximum output voltage Vmax and the minimum output voltage Vmin. The resonant frequency range of LLC converter 110 does not need to be amplified. In this way, the power supply device 100 can meet more different voltage requirements VREQ within a limited resonant frequency range.

In this embodiment, the voltage values of the buck output voltages VBU1 to VBU5 are smaller than the voltage value of the maximum output voltage Vmax and larger than the voltage value of the minimum output voltage Vmin. The voltage values of the buck output voltages VBU1 to VBU5 are different from each other. For example, the voltage value of the buck output voltage VBU1 is 9 volts. The voltage value of the buck output voltage VBU2 is 15 volts. The voltage value of the buck output voltage VBU3 is 20 volts. The voltage value of the buck output voltage VBU4 is 28 volts. The voltage value of the buck output voltage VBU5 is 36 volts. The number of buck output voltages and the voltage value of the buck output voltage of the present invention will be adjusted accordingly based on actual usage requirements, and are not limited to this embodiment. The number of buck output voltages of the present invention may be multiple.

Please refer to FIG. 3 , which is a schematic diagram of the operation of a power supply device and an external device according to another embodiment of the present invention. In this embodiment, the power supply device 200 includes an LLC converter 210, an output blocking switch QB0, a buck module 220, a power supply controller 230, a rectifier 240 and a boost converter 250. In this embodiment, the rectifier 240 rectifies the input voltage VIN to generate a rectified voltage VR. The boost converter 250 boosts the rectified voltage VR to generate the boosted voltage VBO. The LLC converter 210 converts the boosted voltage VBO to generate one of the maximum output voltage Vmax and the minimum output voltage Vmin.

In this embodiment, the power supply controller 230 provides the first signal S1 according to the demand voltage VREQ. The first signal S1 is a signal used to instruct the voltage reducing module 220 to perform a voltage reducing operation. The first signal S1 is a high voltage signal (eg 15 volts). In this embodiment, the external device LD includes the controller PDC. The power supply controller 230 communicates with the controller PDC through the CC pin. The controller PDC at least obtains the power supply capability of the power supply device 200 through the pull-down resistor Rd. During the communication process between the power supply device 200 and the external device LD, the output blocking switch QB0 is turned on. The LLC converter 210 provides the minimum output voltage Vmin to the power input terminal TP of the external device LD. The minimum output voltage Vmin is taken as the initial voltage. At this time, when the required voltage VREQ has not been obtained, the power supply controller 230 does not provide the first signal S1, but provides a low voltage signal (such as 0 volts). Therefore, during the communication process between the power supply device 200 and the external device LD, the voltage reduction module 220 does not perform a voltage reduction operation.

After the communication is completed, when the voltage value of the demand voltage VREQ of the external device LD is substantially equal to the voltage value of the minimum output voltage Vmin, this means that the power supply device 200 can use the minimum output voltage Vmin to power the external device LD. Therefore, the power supply controller 230 turns on the output blocking switch QB0 and does not provide the first signal S1. Therefore, when the voltage value of the demand voltage VREQ is substantially equal to the voltage value of the minimum output voltage Vmin, the voltage reduction module 220 does not perform the voltage reduction operation.

When the voltage value of the demand voltage VREQ is substantially equal to the voltage value of the maximum output voltage Vmax, it means that the power supply device 200 can use the maximum output voltage Vmax to power the external device LD. Therefore, the power supply controller 230 turns on the output blocking switch QB0. At this time, the power supply controller 230 will also provide the first signal S1. Therefore, the buck module 220 will react to the first signal S1 to buck the maximum output voltage Vmax to generate the buck output voltages VBU1 to VBU5, but will not output the buck output voltages VBU1 to VBU5 to the external device LD.

When the voltage value of the demand voltage VREQ is not equal to the voltage value of the maximum output voltage Vmax and the voltage value of the minimum output voltage Vmin, this means that the power supply device 200 cannot use the maximum output voltage Vmax or the minimum output voltage Vmin to power the external device LD. Therefore, the power supply controller 230 turns off the output blocking switch QB0 and provides the first signal S1. The buck module 220 will respond to the first signal S1 to buck the maximum output voltage Vmax, and output a bucked output voltage corresponding to the demand voltage VREQ.

For example, based on the design of the LLC converter 210 and the boost converter 250 , the maximum output voltage Vmax will be equal to 48 volts. The voltage value of the minimum output voltage Vmin will be equal to 5 volts. When the voltage value of the demand voltage VREQ is equal to 9 volts, the power supply controller 230 turns off the output blocking switch QB0 and provides the first signal S1. The buck module 220 will output the buck output voltage VBU1 corresponding to the demand voltage VREQ. For another example, when the voltage value of the demand voltage VREQ is equal to 15 volts, the power supply controller 230 turns off the output blocking switch QB0 and provides the first signal S1. The buck module 220 will output the buck output voltage VBU2 corresponding to the demand voltage VREQ.

In some embodiments, the first signal S1 can be used as a driving voltage for driving the buck module 220 . Therefore, the buck module 220 will be enabled in response to the first signal S1.

In some embodiments, the external device LD provides the second signal according to the demand voltage VREQ (not shown in FIG. 3 ). Similar to the first signal S1, the second signal is also a high voltage signal (eg 15 volts). During the communication process, the external device LD will not provide a second signal. After the communication is completed, when the voltage value of the demand voltage VREQ is substantially equal to the voltage value of the minimum output voltage Vmin, the external device LD will not provide the second signal. When the voltage value of the demand voltage VREQ is greater than the voltage value of the minimum output voltage Vmin, the external device LD will provide the second signal. In other words, under normal circumstances, the timing of the second signal is substantially the same as the timing of the first signal S1. In this way, the buck module 220 can determine the status of the external device LD through the second signal. For example, when the buck module 220 receives the first signal S1 and does not receive the second signal, this indicates that an abnormality occurs in the external device LD. Therefore, the buck module 220 does not buck the maximum output voltage Vmax. On the other hand, when the buck module 220 receives the first signal S1 and the second signal, the buck module 220 bucks the maximum output voltage Vmax.

To further explain, in this embodiment, the rectifier 240 is a full-bridge rectifier. Boost converter 250 includes boost inductor LM1, power switch Q1, diode DO1, and capacitor CO1. The first terminal of the boost inductor LM1 is coupled to the rectifier 240 to receive the rectified voltage VR. The first terminal of the power switch Q1 is coupled to the second terminal of the boost inductor LM1. The second terminal of the power switch Q1 is coupled to the first low reference voltage (eg, primary side ground terminal GND1). The control end of the power switch Q1 is used to receive the control signal SC1. The anode of the diode DO1 is coupled to the second terminal of the boost inductor LM1. The cathode of diode DO1 serves as the output terminal of boost converter 250 . The capacitor CO1 is coupled between the cathode of the diode DO1 and the first low reference voltage.

In this embodiment, the boost converter 250 boosts the rectified voltage VR based on the control signal SC1 to generate the boosted voltage VBO.

In this embodiment, the LLC converter 210 includes a primary side circuit 211, a transformer TR, and a secondary side circuit 212. The primary side circuit 211 includes power switches Q2, Q3, a resonant inductor LR, a magnetizing inductor LM2, and a resonant capacitor CR. The first terminal of the power switch Q2 is coupled to the output terminal of the boost converter 250 . The control end of the power switch Q2 is used to receive the control signal SC2. The first terminal of the power switch Q3 is coupled to the second terminal of the power switch Q2. The second terminal of the power switch Q3 is coupled to the first low reference voltage. The control end of the power switch Q3 is used to receive the control signal SC3. The resonant inductor LR, the magnetizing inductor LM2 and the resonant capacitor CR are coupled to each other in series between the second terminal of the power switch Q2 and the first reference low voltage. Transformer TR includes primary side winding N1 and secondary side windings N2 and N3. The primary side winding N1 is coupled in parallel with the exciting inductor LM2. Secondary side circuit 212 includes diodes DO2, DO3 and capacitor CO2. The first end of the secondary side winding N2 is coupled to the anode of the diode DO2. The second end of the secondary winding N2 is coupled to the first end of the secondary winding N3. The second end of the secondary side winding N3 is coupled to the anode of the diode DO3. The cathode of diode DO2 is coupled to the cathode of diode DO3. The cathode of diode DO2 serves as the output terminal of LLC converter 210 . The first terminal of the capacitor CO2 is coupled to the cathode of the diode DO2. The second terminal of the capacitor CO2 is coupled to the second terminal of the secondary side winding N2 and the second low reference voltage (eg, the secondary side ground terminal GND2).

In this embodiment, the LLC converter 210 converts the boosted voltage VBO based on the control signals SC2 and SC3 to generate one of the maximum output voltage Vmax and the minimum output voltage Vmin. In this embodiment, LLC converter 210 is a half-bridge resonant converter. In some embodiments, the primary side circuit 211 may be implemented with a full-bridge topology. In some embodiments, the secondary side circuit 212 may be implemented with a synchronous rectification topology.

In this embodiment, the control signals SC1 ~ SC3 can be provided by a control circuit. The control signals SC1~SC3 can also be provided by the power supply controller 230.

In this embodiment, the resonant inductor LR, the magnetizing inductor LM2 and the resonant capacitor CR may form a resonant path. The design of the resonant path determines the resonant frequency range of LLC converter 210 . The resonant inductor LR and the resonant capacitor CR can determine the upper limit of the resonant frequency range (resonant frequency f1 as shown in Figure 1). The resonant inductor LR, the magnetizing inductor LM2 and the resonant capacitor CR can determine the lower limit of the resonant frequency range (resonant frequency f2 as shown in Figure 1).

Next, the implementation details of the buck module are explained. Please refer to FIG. 3 and FIG. 4 at the same time. FIG. 4 is a schematic diagram of a voltage-reducing module according to an embodiment of the present invention. In this embodiment, the buck module 220 includes a buck controller 221, buck converters 222_1~222_5, and buck blocking switches QB1~QB5. The buck controller 221 is coupled to the power supply controller 230, the output terminal of the LLC converter 210 and the power input terminal TP. The buck controller 221 is enabled in response to the control of the power supply controller 230 to provide the buck control signal SCB and the selection signals SS1 to SS5. In this embodiment, when the voltage value of the demand voltage VREQ is greater than the voltage value of the minimum output voltage Vmin, the power supply controller 230 provides the first signal S1. The external device LD will provide the second signal S2. When receiving the first signal S1 and the second signal S2, the buck controller 221 provides the buck control signal SCB and the selection signals SS1~SS5. In this embodiment, the buck control signal SCB is a signal with a switching frequency. For example, the switching frequency of the buck control signal SCB is 65 kHz (the present invention is not limited to this).

In this embodiment, the buck converters 222_1 ~ 222_5 are respectively coupled to the output terminals of the LLC converter 210 . The buck converters 222_1 ~ 222_5 respectively generate one of the buck output voltages VBU1 ~ VBU5 according to the maximum output voltage Vmax and the buck control signal SCB. For example, the buck converter 222_1 generates the buck output voltage VBU1 according to the maximum output voltage Vmax and the buck control signal SCB. The buck converter 222_2 generates the buck output voltage VBU2 according to the maximum output voltage Vmax and the buck control signal SCB, and so on.

In this embodiment, the first terminals of the buck blocking switches QB1 to QB5 are respectively coupled to corresponding buck converters. The second terminals of the buck blocking switches QB1 ~ QB5 are respectively coupled to the power input terminal TP. The buck blocking switches QB1~QB5 are turned on or off in response to one of the selection signals SS1~SS5. For example, the first terminal of the buck blocking switch QB1 is coupled to the buck converter 222_1. The second terminal of the buck blocking switch QB1 is coupled to the power input terminal TP. The control terminal of the buck blocking switch QB1 receives the selection signal SS1. The first terminal of the buck blocking switch QB2 is coupled to the buck converter 222_2. The second terminal of the buck blocking switch QB2 is coupled to the power input terminal TP. The control terminal of the buck blocking switch QB2 receives the selection signal SS2, and so on. In this embodiment, the buck blocking switches QB1 to QB5 are respectively implemented by N-type MOSFETs. However, the present invention is not limited to this. The buck blocking switches QB1 to QB5 of the present invention can be implemented by any form of transistor switches, relays, and transmission gates.

In addition, the voltage levels of the selection signals SS1 ~ SS5 may be determined by the demand voltage VREQ. In this embodiment, the buck controller 221 also receives a status signal associated with the demand voltage VREQ to provide the selection signals SS1 to SS5. For example, when the status signal indicates that the voltage value of the demand voltage VREQ is substantially equal to the voltage value of the buck output voltage VBU1, the buck controller 221 will provide the selection signal SS1 of the high voltage level and the selection signal of the low voltage level. Signals SS2~SS5.

In this embodiment, the buck blocking switches QB1 to QB5 and the output blocking switch QB0 are not turned on at the same time. That is to say, when the power supply device 200 is in operation, only one of the buck blocking switches QB1 to QB5 and the output blocking switch QB0 is turned on. Once one of the buck blocking switches QB1~QB5 is turned on, the output blocking switch QB0 must be turned off immediately. In this way, the power supply device 200 can avoid malfunctions in which the maximum output voltage Vmax and at least one bucked output voltage are simultaneously output.

In this embodiment, the buck converter 222_1 includes a buck power switch QX1, a buck diode DX1, and a buck inductor LX1. The first terminal of the buck power switch QX1 is coupled to the output terminal. The control terminal of the buck power switch QX1 is coupled to the buck controller 221 to receive the buck control signal SCB. The cathode of the buck diode DX1 is coupled to the second terminal of the buck power switch QX1. The anode of the buck diode DX1 is coupled to the second low reference voltage. The first terminal of the buck inductor LX1 is coupled to the second terminal of the buck power switch QX1. The second terminal of the buck inductor LX1 is coupled to the first terminal of the buck blocking switch QB1.

The buck converter 222_2 includes a buck power switch QX2, a buck diode DX2, and a buck inductor LX2. The first terminal of the buck power switch QX2 is coupled to the output terminal. The control terminal of the buck power switch QX2 is coupled to the buck controller 221 to receive the buck control signal SCB. The cathode of the buck diode DX2 is coupled to the second terminal of the buck power switch QX2. The anode of the buck diode DX2 is coupled to the second low reference voltage. The first terminal of the buck inductor LX2 is coupled to the second terminal of the buck power switch QX2. The second terminal of the buck inductor LX2 is coupled to the first terminal of the buck blocking switch QB2.

The buck converter 222_3 includes a buck power switch QX3, a buck diode DX3, and a buck inductor LX3. Buck converter 222_4 includes a buck power switch QX4, a buck diode DX4, and a buck inductor LX4. In addition, the buck converter 222_5 includes a buck power switch QX5, a buck diode DX5, and a buck inductor LX5. The configuration of the buck converters 222_3 ~ 222_5 is similar to the buck converters 222_1 and 222_2, so the configuration of the buck converters 222_3 ~ 222_5 will not be described again.

In this embodiment, the inductance values of the buck inductors LX1 ~ LX5 are different from each other. The inductance value relationship of the buck inductors LX1~LX5 will be related to the voltage value relationship of the buck output voltages VBU1~VBU5. Therefore, based on the same buck control signal SCB, the buck converters 222_1 ~ 222_5 can respectively provide buck output voltages VBU1 ~ VBU5 with different voltage values. For example, the voltage value of the buck output voltage VBU1 is 9 volts. The voltage value of the buck output voltage VBU2 is 15 volts. The voltage value of the buck output voltage VBU3 is 20 volts. The voltage value of the buck output voltage VBU4 is 28 volts. The voltage value of the buck output voltage VBU5 is 36 volts. Therefore, the inductance value of the buck inductor LX1 is designed to be 180 microhenries (μH). The inductance value of the buck inductor LX2 is designed to be 300μH. The inductance value of the buck inductor LX3 is designed to be 400μH. The inductance value of the buck inductor LX4 is designed to be 560μH. The inductance value of the buck inductor LX5 is designed to be 720μH.

In this embodiment, the buck inductors LX1 ~ LX5 can be integrated into a single coupled inductor element. Furthermore, the buck inductors LX1~LX5 can share the same iron core. However, the step-down inductors LX1~LX5 are shielded to prevent coupling between the step-down inductors LX1~LX5. In this way, the volume of the voltage-reducing module 220 can be reduced.

This embodiment takes five buck converters 222_1~222_5 as an example. However, the present invention is not limited to this. The number of buck converters of the present invention may be multiple.

In summary, when the voltage value of the demand voltage is substantially equal to one of the voltage value of the maximum output voltage and the voltage value of the minimum output voltage, the power supply controller turns on the output blocking switch. Therefore, the LLC converter outputs one of the maximum output voltage as well as the minimum output voltage. When the voltage value of the demand voltage is not equal to the voltage value of the maximum output voltage and the voltage value of the minimum output voltage, the power supply controller turns off the output blocking switch. Therefore, the buck module provides one of a plurality of buck output voltages to the power input terminal. Since the LLC converter only provides the maximum output voltage as well as the minimum output voltage, the resonant frequency range of the LLC converter does not need to be amplified. In this way, the power supply device can meet more different voltage requirements within a limited resonant frequency range.

Although the present invention has been disclosed above through embodiments, they are not intended to limit the present invention. Anyone with ordinary knowledge in the technical field may make some modifications and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the appended patent application scope.

100, 200: power supply device

110, 210: LLC converter

120, 220: Buck module

130, 230: Power supply controller

211: Primary side circuit

212:Secondary side circuit

221: Buck controller

222_1~222_5: Buck converter

240: Rectifier

250:Boost converter

CO1, CO2: capacitor

CR: resonant capacitor

DO1, DO2, DO3: Diode

DX1~DX5: Buck diodes

f1, f2: resonant frequency

GND1: primary side ground terminal

GND2: secondary side ground terminal

LD: external device

LM1: Boost inductor

LM2: Magnetizing inductor

LR: Resonant inductor

LX1~LX5: Buck inductor

N1: primary side winding

N2, N3: secondary side winding

PDC: controller

Q1, Q2, Q3: power switch

QB0: Output blocking switch

QB1~QB5: Buck blocking switch

QX1~QX5: Buck power switch

Rd: pull-down resistor

S1: first signal

S2: Second signal

SC1~SC3: control signal

SCB: Buck control signal

SS1~SS5: select signal

TO: output terminal

TP: power input terminal

TR: Transformer

VBO: boosted voltage

VBU1~VBU5: Buck output voltage

VIN: input voltage

Vmin: minimum output voltage

Vmax: maximum output voltage

VR: rectified voltage

VREQ: demand voltage

Figure 1 is a trend chart based on the resonance curve of the LLC converter. FIG. 2 is an operation schematic diagram of a power supply device and an external device according to an embodiment of the present invention. FIG. 3 is an operation schematic diagram of a power supply device and an external device according to another embodiment of the present invention. FIG. 4 is a schematic diagram of a voltage-reducing module according to an embodiment of the present invention.

100:Power supply device

110: LLC converter

120: Buck module

130:Power supply controller

LD: external device

QB0: Output blocking switch

TO: output terminal

TP: power input terminal

VBU1~VBU5: Buck output voltage

Vmin: minimum output voltage

Vmax: maximum output voltage

VREQ: demand voltage

Claims (10)

A power supply device used to power an external device, wherein the power supply device includes: An LLC converter having an output terminal configured to output one of a maximum output voltage and a minimum output voltage through the output terminal; an output blocking switch coupled between the output terminal and a power input terminal of the external device; a buck module coupled to the output terminal and the power input terminal; and A power supply controller coupled to the buck module and the output blocking switch is configured to: Obtain a required voltage of the external device, When the voltage value of the demand voltage is substantially equal to one of the voltage value of the maximum output voltage and the voltage value of the minimum output voltage, the output blocking switch is turned on, and When the voltage value of the demand voltage is not equal to the voltage value of the maximum output voltage and the voltage value of the minimum output voltage, the output blocking switch is turned off, and the buck module is controlled to buck multiple voltages according to the maximum output voltage. One of the output voltages is provided to the power input. The power supply device as claimed in claim 1, wherein the power supply controller communicates with the external device through a configuration channel of the universal serial bus to obtain the required voltage of the external device. The power supply device of claim 1, wherein the LLC converter provides the minimum output voltage when the power supply device is connected to the external device. The power supply device according to claim 1, wherein the voltage step-down module includes: A buck controller coupled to the power supply controller, the output terminal and the power input terminal, configured to respond to the control of the power supply controller being enabled, thereby providing a buck control signal and a plurality of selection signals ; A plurality of buck converters are respectively coupled to the output end and generate one of the buck output voltages according to the maximum output voltage and the buck control signal, wherein the buck output voltages are different from each other. ;as well as A plurality of buck blocking switches. The first terminals of the buck blocking switches are respectively coupled to the corresponding buck converters. The second terminals of the buck blocking switches are respectively coupled to the power input terminals. The buck blocking switches The voltage blocking switch is turned on or off respectively in response to one of the selection signals, wherein the buck output voltages and the output blocking switch are not turned on at the same time. The power supply device as claimed in claim 4, wherein a first buck converter among the buck converters includes: a first buck power switch, the first terminal of the first buck power switch is coupled to the output terminal, and the control terminal of the first buck power switch is coupled to the buck controller; a first buck diode, the cathode of the first buck diode is coupled to the second terminal of the first buck power switch, and the anode of the first buck diode is coupled to a reference low potential; and a first buck inductor, the first terminal of the first buck inductor is coupled to the second terminal of the first buck power switch, the second terminal of the first buck inductor is coupled to the A first terminal of a first buck blocking switch in the buck blocking switch. The power supply device as claimed in claim 5, wherein a second buck converter among the buck converters includes: a second buck power switch, the first terminal of the second buck power switch is coupled to the output terminal, and the control terminal of the second buck power switch is coupled to the buck controller; a second buck diode, the cathode of the second buck diode is coupled to the second terminal of the second buck power switch, and the anode of the second buck diode is coupled to the reference low potential; and a second buck inductor, the first terminal of the second buck inductor is coupled to the second terminal of the second buck power switch, the second terminal of the second buck inductor is coupled to the a first terminal of a second buck blocking switch in the buck blocking switch, The inductance value of the first buck inductor is different from the inductance value of the second buck inductor. The power supply device of claim 6, wherein the first buck inductor and the second buck power switch are implemented by a coupled inductor. The power supply device according to claim 1, wherein: After completing the communication and when the voltage value of the demand voltage is greater than the voltage value of the minimum output voltage, the power supply controller provides a first signal to the buck module, and The buck module at least steps down the maximum output voltage in response to the first signal. The power supply device of claim 8, wherein after communication is completed and when the voltage value of the demand voltage is substantially equal to the voltage value of the minimum output voltage, the power supply controller controls the LLC converter to provide the minimum output voltage, Turn on the output blocking switch and stop providing the first signal. The power supply device according to claim 8, wherein: After completing the communication and when the voltage value of the demand voltage is not equal to the voltage value of the minimum output voltage, the external device provides a second signal to the buck module, and The buck module responds to the first signal and the second signal to buck the maximum output voltage.

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