TWI844370B - Power supply device supporting power delivery - Google Patents

Abstract

A power supply device supporting PD (Power Delivery) includes a bridge rectifier, a transformer, a power switch element, an output stage circuit, a feedback compensation circuit, a control circuit, and a light generation circuit. The bridge rectifier generates a rectified voltage according to a first input voltage and a second input voltage. The transformer includes a main coil and a secondary coil. The main coil receives the rectified voltage. The secondary coil generates an induced voltage. The output stage circuit generates an output voltage according to the induced voltage. The control circuit includes a PD IC (Integrated Circuit). The control circuit generates a combination driving signal according to a first communication voltage and a second communication voltage. The light generation circuit generates one or more lights according to the combination driving signal. The aforementioned lights correspond to the level of the output voltage.

Description

Power supply supporting power transmission

The present invention relates to a power supply, and more particularly to a power supply supporting power delivery (PD).

Power supplies are essential components in the field of laptop computers. However, when the output potential of a power supply changes suddenly, users often cannot know it immediately, which will cause safety and convenience problems. In view of this, it is necessary to propose a new solution to overcome the difficulties faced by previous technologies.

In a preferred embodiment, the present invention provides a power supply supporting power transmission, comprising: a bridge rectifier, generating a rectified potential according to a first input potential and a second input potential; a transformer, comprising a main coil and a secondary coil, wherein the main coil is used to receive the rectified potential, and the secondary coil is used to generate an induced potential; a power switch, selectively coupling the main coil to a ground potential according to a pulse width modulation potential; an output stage circuit, generating an induced potential according to the induced potential and a second input potential; A control potential is used to generate an output potential; a feedback compensation circuit is used to generate a feedback potential according to the output potential; a control circuit includes a power transmission integrated circuit, wherein the control circuit generates the pulse width modulation potential, the first control potential, and a comprehensive driving signal according to the feedback potential, a first communication potential, and a second communication potential; and a light generating circuit is used to generate one or more light signals according to the comprehensive driving signal, wherein the light signals correspond to the level of the output potential.

In some embodiments, the light generating circuit operates in an independent display mode, an extended display mode, or a flashing warning mode.

In some embodiments, the bridge rectifier includes: a first diode having an anode and a cathode, wherein the anode of the first diode is coupled to a first input node to receive the first input potential, and the cathode of the first diode is coupled to a first node to output the rectified potential; a second diode having an anode and a cathode, wherein the anode of the second diode is coupled to a second input node to receive the second input potential , and the cathode of the second diode is coupled to the first node; a third diode having an anode and a cathode, wherein the anode of the third diode is coupled to the ground potential, and the cathode of the third diode is coupled to the first input node; and a fourth diode having an anode and a cathode, wherein the anode of the fourth diode is coupled to the ground potential, and the cathode of the fourth diode is coupled to the second input node.

In some embodiments, the transformer further has a built-in excitation inductor, the main coil having a first end and a second end, the first end of the main coil being coupled to the first node to receive the rectified potential, the second end of the main coil being coupled to a second node, the excitation inductor having a first end and a second end, the first end of the excitation inductor being coupled to the first node, the second end of the excitation inductor being coupled to the second node, the secondary coil having a first end and a second end, the first end of the secondary coil being coupled to a third node to output the induced potential, and the second end of the secondary coil being coupled to a common node.

In some embodiments, the power switch includes: a first transistor having a control end, a first end, and a second end, wherein the control end of the first transistor is used to receive the pulse width modulation potential, the first end of the first transistor is coupled to the ground potential, and the second end of the first transistor is coupled to the second node.

In some embodiments, the output stage circuit includes: a fifth diode having an anode and a cathode, wherein the anode of the fifth diode is coupled to the third node to receive the induced potential, and the cathode of the fifth diode is coupled to a fourth node; a first capacitor having a first end and a second end, wherein the first end of the first capacitor is coupled to the fourth node, and the second end of the first capacitor is coupled to the common node; a second transistor having a control end, a first end, and a second end, wherein the control end of the second transistor is used to receive the first control potential, the first end of the second transistor is coupled to an output node to selectively output the output potential, and the second end of the second transistor is coupled to the fourth node; and a second capacitor having a first end and a second end, wherein the first end of the second capacitor is coupled to the output node, and the second end of the second capacitor is coupled to the common node.

In some embodiments, the feedback compensation circuit includes: a first resistor having a first end and a second end, wherein the first end of the first resistor is coupled to the output node to receive the output potential, and the second end of the first resistor is coupled to a fifth node; a second resistor having a first end and a second end, wherein the first end of the second resistor is coupled to the fifth node, and the second end of the second resistor is coupled to the common node; a third capacitor having a first end and a second end, wherein the first end of the third capacitor is coupled to a sixth node, and the second end of the third capacitor is coupled to the fifth node; a voltage regulator having an anode, a cathode, and a reference terminal, wherein the anode of the voltage regulator is coupled to the common node. point, the cathode of the regulator is coupled to the sixth node, and the reference end of the regulator is coupled to the fifth node; a linear optical coupler, comprising a light-emitting diode and a bipolar junction transistor, wherein the light-emitting diode has an anode and a cathode, the anode of the light-emitting diode is coupled to the output node, the cathode of the light-emitting diode is coupled to the sixth node, and the bipolar junction transistor The junction transistor has a collector and an emitter, the collector of the bipolar junction transistor is used to output the feedback potential, and the emitter of the bipolar junction transistor is coupled to a seventh node; and a fourth capacitor has a first end and a second end, wherein the first end of the fourth capacitor is coupled to the seventh node, and the second end of the fourth capacitor is coupled to the ground potential.

In some embodiments, the comprehensive driving signal includes a first operating potential, a second operating potential, a first driving potential, a second driving potential, a third driving potential, and a fourth driving potential, and the control circuit further includes: a microcontroller that generates the pulse width modulation potential, the first control potential, and the first operating potential based on the feedback potential and a second control potential; and the power transmission integrated circuit generates the second control potential, the second operating potential, the first driving potential, the second driving potential, the third driving potential, and the fourth driving potential based on the first communication potential and the second communication potential.

In some embodiments, the light generating circuit includes: a third transistor having a control end, a first end, and a second end, wherein the control end of the third transistor is used to receive the first operating potential, the first end of the third transistor is coupled to a control node, and the second end of the third transistor is used to receive the pulse width modulation potential; a fourth transistor having a control end, a first end, and a second end, wherein the control end of the fourth transistor is used to receive the second operating potential, the first end of the fourth transistor is coupled to an eighth node, and the second end of the fourth transistor is coupled to the fifth node; and an amplifier having an input end and an output end, wherein the input end of the amplifier is coupled to the eighth node, and the output end of the amplifier is coupled to the control node.

In some embodiments, the light generating circuit further includes: a third resistor having a first end and a second end, wherein the first end of the third resistor is coupled to the output node, and the second end of the third resistor is coupled to a ninth node; a first light emitting diode having an anode and a cathode, wherein the anode of the first light emitting diode is coupled to the ninth node, and the cathode of the first light emitting diode is coupled to a tenth node; a fifth transistor having a control end, a a first terminal, and a second terminal, wherein the control terminal of the fifth transistor is used to receive the first driving potential, the first terminal of the fifth transistor is coupled to an eleventh node, and the second terminal of the fifth transistor is coupled to the tenth node; a sixth transistor having a control terminal, a first terminal, and a second terminal, wherein the control terminal of the sixth transistor is coupled to the control node, the first terminal of the sixth transistor is coupled to the common node, and the second terminal of the sixth transistor is coupled to the common node. connected to the eleventh node; a fourth resistor having a first end and a second end, wherein the first end of the fourth resistor is coupled to the output node, and the second end of the fourth resistor is coupled to a twelfth node; a second light-emitting diode having an anode and a cathode, wherein the anode of the second light-emitting diode is coupled to the twelfth node, and the cathode of the second light-emitting diode is coupled to a thirteenth node; a seventh transistor having a control end, a first end, and a a second terminal, wherein the control terminal of the seventh transistor is used to receive the second driving potential, the first terminal of the seventh transistor is coupled to a fourteenth node, and the second terminal of the seventh transistor is coupled to the thirteenth node; an eighth transistor having a control terminal, a first terminal, and a second terminal, wherein the control terminal of the eighth transistor is coupled to the control node, the first terminal of the eighth transistor is coupled to the common node, and the second terminal of the eighth transistor is coupled to the fourteenth node. a fifth resistor having a first terminal and a second terminal, wherein the first terminal of the fifth resistor is coupled to the output node, and the second terminal of the fifth resistor is coupled to a fifteenth node; a third light-emitting diode having an anode and a cathode, wherein the anode of the third light-emitting diode is coupled to the fifteenth node, and the cathode of the third light-emitting diode is coupled to a sixteenth node; a ninth transistor having a control terminal, a first terminal, and a second terminal, wherein The control terminal of the ninth transistor is used to receive the third driving potential, the first terminal of the ninth transistor is coupled to a seventeenth node, and the second terminal of the ninth transistor is coupled to the sixteenth node; a tenth transistor having a control terminal, a first terminal, and a second terminal, wherein the control terminal of the tenth transistor is coupled to the control node, the first terminal of the tenth transistor is coupled to the common node, and the second terminal of the tenth transistor is coupled to the seventeenth node; a sixth transistor a sixth resistor having a first end and a second end, wherein the first end of the sixth resistor is coupled to the output node, and the second end of the sixth resistor is coupled to an eighteenth node; a fourth light-emitting diode having an anode and a cathode, wherein the anode of the fourth light-emitting diode is coupled to the eighteenth node, and the cathode of the fourth light-emitting diode is coupled to a nineteenth node; an eleventh transistor having a control end, a first end, and a second end, wherein the eleventh transistor The control terminal of the body is used to receive the fourth driving potential, the first terminal of the eleventh transistor is coupled to a twentieth node, and the second terminal of the eleventh transistor is coupled to the nineteenth node; and a twelfth transistor, having a control terminal, a first terminal, and a second terminal, wherein the control terminal of the twelfth transistor is coupled to the control node, the first terminal of the twelfth transistor is coupled to the common node, and the second terminal of the twelfth transistor is coupled to the twentieth node.

In order to make the purpose, features and advantages of the present invention more clearly understood, specific embodiments of the present invention are specifically listed below and described in detail with reference to the accompanying drawings.

Certain terms are used in the specification and patent application to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and patent application do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criterion for distinction. The words "include" and "including" mentioned throughout the specification and patent application are open terms and should be interpreted as "including but not limited to". The word "substantially" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and achieve the basic technical effect. In addition, the word "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if a first device is described herein as being coupled to a second device, it means that the first device may be directly electrically connected to the second device, or may be indirectly electrically connected to the second device via other devices or connection means.

FIG. 1 is a schematic diagram showing a power supply 100 according to an embodiment of the present invention. For example, the power supply 100 can be applied to a desktop computer, a laptop computer, or an all-in-one computer. As shown in FIG. 1, the power supply 100 includes: a bridge rectifier 110, a transformer 120, a power switch 130, an output stage circuit 140, a feedback compensation circuit 150, a control circuit 160, and a light generating circuit 170. It should be noted that, although not shown in FIG. 1, the power supply 100 may further include other components, such as: a voltage regulator or (and) a negative feedback circuit.

The bridge rectifier 110 can generate a rectified potential VR according to a first input potential VIN1 and a second input potential VIN2, wherein an AC voltage with any frequency and any amplitude can be formed between the first input potential VIN1 and the second input potential VIN2. For example, the frequency of the AC voltage can be about 50 Hz or 60 Hz, and the root mean square (RMS) value of the AC voltage can be between 90 V and 264 V, but is not limited thereto. The transformer 120 includes a main coil 121 and a secondary coil 122, wherein the main coil 121 can be located on one side of the transformer 120, and the secondary coil 122 can be located on the other side of the transformer 120. The main coil 121 can be used to receive the rectified potential VR, and in response, the secondary coil 122 can be used to generate an induced potential VS. The power switch 130 can selectively couple the main coil 121 to a ground potential VSS (eg, 0V) according to a pulse width modulation (PWM) potential VA. For example, if the pulse width modulation potential VA is a high logic level (i.e., logic "1"), the power switch 130 can couple the main coil 121 to the ground potential VSS (i.e., the power switch 130 can be similar to a short circuit path); conversely, if the pulse width modulation potential VA is a low logic level (i.e., logic "0"), the power switch 130 will not couple the main coil 121 to the ground potential VSS (i.e., the power switch 130 can be similar to an open circuit path). The output stage circuit 140 can generate an output potential VOUT according to the sensed potential VS and a first control potential VC1. For example, the output potential VOUT may be a DC potential, and its potential level may be between 5V and 20V, but is not limited thereto. The feedback compensation circuit 150 may generate a feedback potential VF according to the output potential VOUT. The control circuit 160 includes a power delivery integrated circuit (PD IC) 164, wherein the control circuit 160 may generate a pulse width modulation potential VA, a first control potential VC1, and a comprehensive drive signal SD according to the feedback potential VF, a first communication potential VM1, and a second communication potential VM2. The light generating circuit 170 can generate one or more light signals 175-1, 175-2, ..., 175-N according to the integrated driving signal SD, wherein "N" is any positive integer greater than or equal to 1. It should be noted that the aforementioned light signals 175-1, 175-2, ..., 175-N can correspond to the level of the output potential VOUT. Under this design, the power supply 100 of the present invention can support the function of power transmission, and the user can know the instantaneous level of the output potential VOUT of the power supply 100 by observing the aforementioned light signals 175-1, 175-2, ..., 175-N, thereby improving the overall safety and convenience of use.

The following embodiments will introduce the detailed structure and operation of the power supply 100. It must be understood that these drawings and descriptions are only examples and are not intended to limit the scope of the present invention.

FIG. 2 is a circuit diagram of a power supply 200 according to an embodiment of the present invention. In the embodiment of FIG. 2, the power supply 200 has a first input node NIN1, a second input node NIN2, and an output node NOUT, and includes a bridge rectifier 210, a transformer 220, a power switch 230, an output stage circuit 240, a feedback compensation circuit 250, a control circuit 260, and a light generating circuit 270. The first input node NIN1 and the second input node NIN2 of the power supply 200 can receive a first input potential VIN1 and a second input potential VIN2 from an external input power source (not shown), respectively. The output node NOUT of the power supply 200 can be used to output an output potential VOUT to a system end (not shown), such as a notebook computer.

The bridge rectifier 210 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The first diode D1 has an anode and a cathode, wherein the anode of the first diode D1 is coupled to the first input node NIN1, and the cathode of the first diode D1 is coupled to a first node N1 to output a rectified potential VR. The second diode D2 has an anode and a cathode, wherein the anode of the second diode D2 is coupled to the second input node NIN2, and the cathode of the second diode D2 is coupled to the first node N1. The third diode D3 has an anode and a cathode, wherein the anode of the third diode D3 is coupled to a ground potential VSS, and the cathode of the third diode D3 is coupled to the first input node NIN1. The fourth diode D4 has an anode and a cathode, wherein the anode of the fourth diode D4 is coupled to the ground potential VSS, and the cathode of the fourth diode D4 is coupled to the second input node NIN2.

The transformer 220 includes a main coil 221 and a secondary coil 222, wherein the transformer 220 may further have a built-in excitation inductor LM. The excitation inductor LM may be an inherent component that is produced when the transformer 220 is manufactured, and it is not an external independent component. The main coil 221 and the excitation inductor LM may be located on the same side of the transformer 220 (e.g., the primary side), and the secondary coil 222 may be located on the other side of the transformer 220 (e.g., the secondary side, which may be isolated from the primary side). In detail, the main coil 221 has a first end and a second end, wherein the first end of the main coil 221 is coupled to the first node N1 to receive the rectified potential VR, and the second end of the main coil 221 is coupled to a second node N2. The magnetizing inductor LM has a first end and a second end, wherein the first end of the magnetizing inductor LM is coupled to the first node N1, and the second end of the magnetizing inductor LM is coupled to the second node N2. The secondary coil 222 has a first end and a second end, wherein the first end of the secondary coil 222 is coupled to a third node N3 to output an induced potential VS, and the second end of the secondary coil 222 is coupled to a common node NCM. For example, the common node NCM can be regarded as another ground potential, which can be the same as or different from the aforementioned ground potential VSS.

The power switch 230 includes a first transistor M1. For example, the first transistor M1 may be an N-type Metal-Oxide-Semiconductor Field-Effect Transistor (NMOSFET). The first transistor M1 has a control terminal (e.g., a gate), a first terminal (e.g., a source), and a second terminal (e.g., a drain), wherein the control terminal of the first transistor M1 is used to receive a pulse width modulation potential VA, the first terminal of the first transistor M1 is coupled to the ground potential VSS, and the second terminal of the first transistor M1 is coupled to the second node N2.

The output stage circuit 240 includes a second transistor M2, a fifth diode D5, a first capacitor C1, and a second capacitor C2. For example, the second transistor M2 can be an N-type metal oxide semi-conductor field effect transistor. The fifth diode D5 has an anode and a cathode, wherein the anode of the fifth diode D5 is coupled to the third node N3 to receive the induced potential VS, and the cathode of the fifth diode D5 is coupled to a fourth node N4. The first capacitor C1 has a first end and a second end, wherein the first end of the first capacitor C1 is coupled to the fourth node N4, and the second end of the first capacitor C1 is coupled to the common node NCM. The second transistor M2 has a control terminal (e.g., a gate), a first terminal (e.g., a source), and a second terminal (e.g., a drain), wherein the control terminal of the second transistor M2 is used to receive a first control potential VC1, the first terminal of the second transistor M2 is coupled to the output node NOUT, and the second terminal of the second transistor M2 is coupled to the fourth node N4. The second capacitor C2 has a first terminal and a second terminal, wherein the first terminal of the second capacitor C2 is coupled to the output node NOUT, and the second terminal of the second capacitor C2 is coupled to the common node NCM. In some embodiments, the output stage circuit 240 can be used to selectively output the aforementioned output potential VOUT. For example, if the first control potential VC1 is a high logic level, the second transistor M2 will be enabled, and the output stage circuit 240 will be able to normally output the aforementioned output potential VOUT; conversely, if the first control potential VC1 is a low logic level, the second transistor M2 will be disabled, and the output stage circuit 240 will stop outputting the aforementioned output potential VOUT.

In some embodiments, the feedback compensation circuit 250 includes a voltage regulator 252, a linear optical coupler 254, a third capacitor C3, a fourth capacitor C4, a first resistor R1, and a second resistor R2.

The first resistor R1 has a first end and a second end, wherein the first end of the first resistor R1 is coupled to the output node NOUT to receive the output potential VOUT, and the second end of the first resistor R1 is coupled to a fifth node N5. The second resistor R2 has a first end and a second end, wherein the first end of the second resistor R2 is coupled to the fifth node N5, and the second end of the second resistor R2 is coupled to the common node NCM. The third capacitor C3 has a first end and a second end, wherein the first end of the third capacitor C3 is coupled to a sixth node N6, and the second end of the third capacitor C3 is coupled to the fifth node N5.

In some embodiments, the voltage regulator 252 is implemented by a TL431 electronic component. The voltage regulator 252 has an anode, a cathode, and a reference terminal, wherein the anode of the voltage regulator 252 is coupled to the common node NCM, the cathode of the voltage regulator 252 is coupled to the sixth node N6, and the reference terminal of the voltage regulator 252 is coupled to the fifth node N5.

In some embodiments, the linear optical coupler 254 is implemented by a PC817 electronic component. The linear optical coupler 254 includes a light emitting diode DL and a bipolar junction transistor Q1 (e.g., NPN type). The light emitting diode DL has an anode and a cathode, wherein the anode of the light emitting diode DL is coupled to the output node NOUT, and the cathode of the light emitting diode DL is coupled to the sixth node N6. The bipolar junction transistor Q1 has a collector and an emitter, wherein the collector of the bipolar junction transistor Q1 is used to output a feedback potential VF, and the emitter of the bipolar junction transistor Q1 is coupled to a seventh node N7. The fourth capacitor C4 has a first terminal and a second terminal, wherein the first terminal of the fourth capacitor C4 is coupled to the seventh node N7, and the second terminal of the fourth capacitor C4 is coupled to the ground potential VSS.

The control circuit 260 may generate a pulse width modulation potential VA, a first control potential VC1, and a comprehensive drive signal SD according to the feedback potential VF, a first communication potential VM1, and a second communication potential VM2. In some embodiments, the control circuit 260 includes a microcontroller unit (MCU) 262 and a power transmission integrated circuit 264. In detail, the comprehensive drive signal SD may include a first operating potential VE1, a second operating potential VE2, a first drive potential VD1, a second drive potential VD2, a third drive potential VD3, and a fourth drive potential VD4.

The microcontroller 262 can generate the aforementioned pulse width modulation potential VA according to the feedback potential VF. For example, the pulse width modulation potential VA can be maintained at a fixed potential when the power supply 200 is just initialized, and can provide a periodic time pulse waveform after the power supply 200 enters the normal use stage. In addition, the microcontroller 260 can also generate the aforementioned first control potential VC1 and the first operation potential VE1 according to a second control potential VC2, wherein the first control potential VC1 and the second control potential VC2 can have the same logic level.

The power transmission integrated circuit 264 can generate a second control potential VC2, a second operation potential VE2, a first drive potential VD1, a second drive potential VD2, a third drive potential VD3, and a fourth drive potential VD4 according to the first communication potential VM1 and the second communication potential VM2. In some embodiments, the power supply 200 can support the USB (Universal Serial Bus) Type-C specification, wherein the power transmission integrated circuit 264 can receive the first communication potential VM1 via a CC (Configuration Channel) pin 266. For example, when the power supply 200 is coupled to a system end, the power transmission integrated circuit 264 can output a fixed current to the CC pin 266, and can then receive the first communication potential VM1 from the system end through the CC pin 266. In some embodiments, the power transmission integrated circuit 264 can further estimate the operating state of the system end and the instantaneous level of the output potential VOUT by analyzing the first communication potential VM1, but is not limited thereto.

In some embodiments, when the power supply 200 is coupled to the system end, the power transmission integrated circuit 264 can further receive a second communication potential VM2 from the system end via a communication pin 268, wherein the second communication potential VM2 can be used to select different operation modes. For example, the power transmission integrated circuit 264 can control the microcontroller 262 and the light generating circuit 270 according to the second communication potential VM2, so that the light generating circuit 270 can be operated in one of the three modes of an independent display mode, an extended display mode, or a flashing warning mode. It must be understood that the aforementioned three operation modes of the light generating circuit 270 will be described in detail in the subsequent embodiments.

The light generating circuit 270 includes: an amplifier 272, a third transistor M3, a fourth transistor M4, a fifth transistor M5, a sixth transistor M6, a seventh transistor M7, an eighth transistor M8, a ninth transistor M9, a tenth transistor M10, an eleventh transistor M11, a twelfth transistor M12, a first light emitting diode DL1, a second light emitting diode DL2, a third light emitting diode DL3, a fourth light emitting diode DL4, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. For example, each of the third transistor M3, the fourth transistor M4, the fifth transistor M5, the sixth transistor M6, the seventh transistor M7, the eighth transistor M8, the ninth transistor M9, the tenth transistor M10, the eleventh transistor M11, and the twelfth transistor M12 may be an N-type metal oxide semi-conductor field effect transistor.

The third transistor M3 has a control terminal (e.g., a gate), a first terminal (e.g., a source), and a second terminal (e.g., a drain), wherein the control terminal of the third transistor M3 is used to receive the first operation potential VE1, the first terminal of the third transistor M3 is coupled to a control node NC, and the second terminal of the third transistor M3 is used to receive the pulse width modulation potential VA. The fourth transistor M4 has a control terminal (e.g., a gate), a first terminal (e.g., a source), and a second terminal (e.g., a drain), wherein the control terminal of the fourth transistor M4 is used to receive the second operation potential VE2, the first terminal of the fourth transistor M4 is coupled to an eighth node N8, and the second terminal of the fourth transistor M4 is coupled to the fifth node N5. The amplifier 272 has an input terminal and an output terminal, wherein the input terminal of the amplifier 272 is coupled to the eighth node N8, and the output terminal of the amplifier 272 is coupled to the control node NC. For example, if the amplifier 272 has a gain multiplier K, the potential at the control node NC will be approximately equal to K times the potential at the eighth node N8, wherein the aforementioned gain multiplier K can be any number greater than 1.

The third resistor R3 has a first end and a second end, wherein the first end of the third resistor R3 is coupled to the output node NOUT, and the second end of the third resistor R3 is coupled to a ninth node N9. The first light emitting diode DL1 has an anode and a cathode, wherein the anode of the first light emitting diode DL1 is coupled to the ninth node N9, and the cathode of the first light emitting diode DL1 is coupled to a tenth node N10. The fifth transistor M5 has a control terminal (e.g., a gate), a first terminal (e.g., a source), and a second terminal (e.g., a drain), wherein the control terminal of the fifth transistor M5 is used to receive the first driving potential VD1, the first terminal of the fifth transistor M5 is coupled to an eleventh node N11, and the second terminal of the fifth transistor M5 is coupled to the tenth node N10. The sixth transistor M6 has a control terminal (e.g., a gate), a first terminal (e.g., a source), and a second terminal (e.g., a drain), wherein the control terminal of the sixth transistor M6 is coupled to the control node NC, the first terminal of the sixth transistor M6 is coupled to the common node NCM, and the second terminal of the sixth transistor M6 is coupled to the eleventh node N11. It should be noted that the first light emitting diode DL1 can be used to selectively generate a first light signal 275-1.

The fourth resistor R4 has a first end and a second end, wherein the first end of the fourth resistor R4 is coupled to the output node NOUT, and the second end of the fourth resistor R4 is coupled to a twelfth node N12. The second light emitting diode DL2 has an anode and a cathode, wherein the anode of the second light emitting diode DL2 is coupled to the twelfth node N12, and the cathode of the second light emitting diode DL2 is coupled to a thirteenth node N13. The seventh transistor M7 has a control terminal (e.g., a gate), a first terminal (e.g., a source), and a second terminal (e.g., a drain), wherein the control terminal of the seventh transistor M7 is used to receive the second driving potential VD2, the first terminal of the seventh transistor M7 is coupled to a fourteenth node N14, and the second terminal of the seventh transistor M7 is coupled to the thirteenth node N13. The eighth transistor M8 has a control terminal (e.g., a gate), a first terminal (e.g., a source), and a second terminal (e.g., a drain), wherein the control terminal of the eighth transistor M8 is coupled to the control node NC, the first terminal of the eighth transistor M8 is coupled to the common node NCM, and the second terminal of the eighth transistor M8 is coupled to the fourteenth node N14. It should be noted that the second light emitting diode DL2 can be used to selectively generate a second light signal 275-2.

The fifth resistor R5 has a first end and a second end, wherein the first end of the fifth resistor R5 is coupled to the output node NOUT, and the second end of the fifth resistor R5 is coupled to a fifteenth node N15. The third light emitting diode DL3 has an anode and a cathode, wherein the anode of the third light emitting diode DL3 is coupled to the fifteenth node N15, and the cathode of the third light emitting diode DL3 is coupled to a sixteenth node N16. The ninth transistor M9 has a control terminal (e.g., a gate), a first terminal (e.g., a source), and a second terminal (e.g., a drain), wherein the control terminal of the ninth transistor M9 is used to receive the third driving potential VD3, the first terminal of the ninth transistor M9 is coupled to a seventeenth node N17, and the second terminal of the ninth transistor M9 is coupled to the sixteenth node N16. The tenth transistor M10 has a control terminal (e.g., a gate), a first terminal (e.g., a source), and a second terminal (e.g., a drain), wherein the control terminal of the tenth transistor M10 is coupled to the control node NC, the first terminal of the tenth transistor M10 is coupled to the common node NCM, and the second terminal of the tenth transistor M10 is coupled to the seventeenth node N17. It should be noted that the third light emitting diode DL3 can be used to selectively generate a third light signal 275-3.

The sixth resistor R6 has a first terminal and a second terminal, wherein the first terminal of the sixth resistor R6 is coupled to the output node NOUT, and the second terminal of the sixth resistor R6 is coupled to an eighteenth node N18. The fourth light emitting diode DL4 has an anode and a cathode, wherein the anode of the fourth light emitting diode DL4 is coupled to the eighteenth node N18, and the cathode of the fourth light emitting diode DL4 is coupled to a nineteenth node N19. The eleventh transistor M11 has a control terminal (e.g., a gate), a first terminal (e.g., a source), and a second terminal (e.g., a drain), wherein the control terminal of the eleventh transistor M11 is used to receive the fourth driving potential VD4, the first terminal of the eleventh transistor M11 is coupled to a twentieth node N20, and the second terminal of the eleventh transistor M11 is coupled to the nineteenth node N19. The twelfth transistor M12 has a control terminal (e.g., a gate), a first terminal (e.g., a source), and a second terminal (e.g., a drain), wherein the control terminal of the twelfth transistor M12 is coupled to the control node NC, the first terminal of the twelfth transistor M12 is coupled to the common node NCM, and the second terminal of the twelfth transistor M12 is coupled to the twentieth node N20. It should be noted that the fourth light emitting diode DL4 can be used to selectively generate a fourth light signal 275-4.

In some embodiments, the operating principle of the power supply 200 may be as follows. Initially, the power supply 200 may be coupled to a system terminal, wherein the power transmission integrated circuit 264 may communicate with the system terminal according to the first communication potential VM1 at its CC pin 266. If the first communication potential VM1 falls within a normal range, the power transmission integrated circuit 264 will generate a second control potential VC2 with a high logic level, and the microcontroller 262 will also output the first control potential VC1 with a high logic level to enable the output stage circuit 240. In addition, the power transmission integrated circuit 264 can also select an operation mode of the light generating circuit 270 according to the second communication potential VM2 at its communication pin 268. For example, if the second communication potential VM2 is a low logic level, the light generating circuit 270 can be operated in an independent display mode; on the contrary, if the second communication potential VM2 is a high logic level, the light generating circuit 270 can be operated in an extended display mode, but it is not limited thereto. In some embodiments, a default operation mode of the light generating circuit 270 can be the aforementioned independent display mode.

Then, after the aforementioned communication procedures are completed, the power transmission integrated circuit 264 can output a first operation potential VE1 with a low logic level to disable the third transistor M3, and can output a second operation potential VE2 with a high logic level to enable the fourth transistor M4. At this time, the amplifier 272 can be used to pull up the potential at the control node NC, so that the sixth transistor M6, the eighth transistor M8, the tenth transistor M10, and the twelfth transistor M12 are all enabled. In some embodiments, the power transmission integrated circuit 264 can obtain the instantaneous level of the output potential VOUT from the system end according to the first communication potential VM1. Finally, the power transmission integrated circuit 264 can control the light generating circuit 270 to appropriately adjust the first light signal 275-1, the second light signal 275-2, the third light signal 275-3, and the fourth light signal 275-4, so as to indicate various levels of the output potential VOUT.

In some embodiments, if the light generating circuit 270 operates in the independent display mode, the power transmission integrated circuit 264 can generate the driving potential of the following table 1 based on the output potential VOUT: Output potential level First drive potential VD1 Second drive potential VD2 The third driving potential VD3 Fourth drive potential VD4 5V Logic 1 Logic 0 Logic 0 Logic 0 9V Logic 0 Logic 1 Logic 0 Logic 0 15V Logic 0 Logic 0 Logic 1 Logic 0 20V Logic 0 Logic 0 Logic 0 Logic 1 Table 1: Relationship between output potential and drive potential in independent display mode

In some embodiments, if the light generating circuit 270 operates in the extended display mode, the power transmission integrated circuit 264 can generate the driving potential of the following table 2 based on the output potential VOUT: Output potential level First drive potential VD1 Second drive potential VD2 The third driving potential VD3 Fourth drive potential VD4 5V Logic 1 Logic 0 Logic 0 Logic 0 9V Logic 1 Logic 1 Logic 0 Logic 0 15V Logic 1 Logic 1 Logic 1 Logic 0 20V Logic 1 Logic 1 Logic 1 Logic 1 Table 2: Relationship between output potential and drive potential in extended display mode

In other words, in the independent display mode, the light generating circuit 270 will only light up one of the first light signal 275-1, the second light signal 275-2, the third light signal 275-3, and the fourth light signal 275-4. On the contrary, in the extended display mode, the light generating circuit 270 may light up one or more of the first light signal 275-1, the second light signal 275-2, the third light signal 275-3, and the fourth light signal 275-4. Therefore, the user can accurately estimate the instantaneous level of the output potential VOUT by observing the first light signal 275-1, the second light signal 275-2, the third light signal 275-3, and the fourth light signal 275-4 of the light generating circuit 270.

In other embodiments, if the power transmission integrated circuit 264 detects that the power supply 200 has entered a protection state, the power transmission integrated circuit 264 will force the light generation circuit 270 to operate in a flashing warning mode. For example, the aforementioned protection state may include: overvoltage protection, undervoltage protection, overcurrent protection, and short-circuit current protection, but is not limited thereto. The power transmission integrated circuit 264 can discover that the power supply 200 has entered the protection state by analyzing the first communication potential VM1. Alternatively, the microcontroller 262 can also notify the power transmission integrated circuit 264 that the power supply 200 has entered the protection state.

If the light generating circuit 270 operates in the flashing warning mode, the first communication potential VM1 at the CC pin 266 will be forced to be pulled up to a high logic level (e.g., 5V). The power transmission integrated circuit 264 will be able to output a first operation potential VE1 with a high logic level to enable the third transistor M3, and can output a second operation potential VE2 with a low logic level to disable the fourth transistor M4. At this time, the sixth transistor M6, the eighth transistor M8, the tenth transistor M10, and the twelfth transistor M12 can all be driven by a pulse width modulation potential VA having a high switching frequency (e.g., 65kHz), so that the first light signal 275-1, the second light signal 275-2, the third light signal 275-3, and the fourth light signal 275-4 of the light generating circuit 270 all flash alternately. In the flashing warning mode, the power transmission integrated circuit 264 can also generate a second control potential VC2 having a low logic level, and the microcontroller 262 can also output a first control potential VC1 having a low logic level to disable the output stage circuit 240. With this design, the user can quickly detect abnormal conditions of the power supply 200, thereby helping to improve its overall safety.

FIG. 3 shows an external view of a power supply 300 according to an embodiment of the present invention. In the embodiment of FIG. 3 , a light generating circuit 370 of the power supply 300 can use a first light signal 375-1, a second light signal 375-2, a third light signal 375-3, and a fourth light signal 375-4 to indicate the instantaneous level of its output potential VOUT. For example, the first light number 375-1 may correspond to the dot matrix number "5", which may represent that the level of the output potential VOUT is 5V; the second light number 375-2 may correspond to the dot matrix number "9", which may represent that the level of the output potential VOUT is 9V; the third light number 375-3 may correspond to the dot matrix number "1", which may represent that the level of the output potential VOUT is 15V; and the fourth light number 375-4 may correspond to the dot matrix number "2", which may represent that the level of the output potential VOUT is 20V. It must be understood that the aforementioned light numbers and levels are only examples, and they can be adjusted according to different needs.

The present invention proposes a novel power supply that can support the function of power transmission. According to actual measurement results, the power supply using the above design can use various light signal combinations to indicate different levels of its output potential, so it is very suitable for application in various types of devices.

It is worth noting that the potential, current, resistance, inductance, capacitance, and other component parameters described above are not limiting conditions of the present invention. Designers can adjust these settings according to different needs. The power supply of the present invention is not limited to the states shown in Figures 1-3. The present invention may only include any one or more features of any one or more embodiments of Figures 1-3. In other words, not all of the features shown in the diagrams need to be implemented in the power supply of the present invention at the same time. Although the embodiments of the present invention use metal oxide semi-conductor field effect transistors as an example, the present invention is not limited to this. People in the technical field can use other types of transistors, such as junction field effect transistors, or fin field effect transistors, etc., without affecting the effects of the present invention.

The ordinal numbers in this specification and the scope of the patent application, such as "first", "second", "third", etc., have no sequential relationship with each other, and are only used to mark and distinguish two different components with the same name.

Although the present invention is disclosed as above with the preferred embodiments, it is not intended to limit the scope of the present invention. Anyone skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the attached patent application.

100,200,300:Power supply

110,210: Bridge rectifier

120,220: Transformer

121,221: Main coil

122,222: Secondary coil

130,230: Power switch

140,240: Output stage circuit

150,250: Feedback compensation circuit

160,260: Control circuit

164,264: Power transmission integrated circuit

170,270,370: Light generating circuit

175-1,175-2,175-N: Light

262:Microcontroller

266:CC foot position

268:Communication Foot Position

272:Amplifier

275-1,375-1: First Light

275-2,375-2: Second Light

275-3,375-3: Light No. 3

275-4,375-4: Light No. 4

C1: First capacitor

C2: Second capacitor

C3: The third capacitor

C4: The third capacitor

D1: The first diode

D2: Second diode

D3: The third diode

D4: The fourth second pole

D5: The fifth diode

DL: Light Emitting Diode

DL1: First light emitting diode

DL2: Second light-emitting diode

DL3: The third light-emitting diode

DL4: The fourth light-emitting diode

K: Gain ratio

LM: Magnetizing Inductor

M1: First transistor

M2: Second transistor

M3: The third transistor

M4: The fourth transistor

M5: The fifth transistor

M6: The sixth transistor

M7: The seventh transistor

M8: The eighth transistor

M9: Ninth transistor

M10: The tenth transistor

M11: Eleventh transistor

M12: 12th transistor

N1: First node

N2: Second node

N3: The third node

N4: The fourth node

N5: The fifth node

N6: Node 6

N7: Node 7

N8: Node 8

N9: Ninth Node

N10: Node 10

N11: Node 11

N12: 12th node

N13: Node 13

N14: Node 14

N15: Node 15

N16: Node 16

N17: Node 17

N18: Node 18

N19: Node 19

N20: 20th node

NC: Control Node

NCM: Common Node

NIN1: First input node

NIN2: Second input node

NOUT: Output node

Q1: Bipolar Junction Transistor

R1: The first resistor

R2: Second resistor

R3: The third resistor

R4: The fourth resistor

R5: The fifth resistor

R6: The sixth resistor

SD: Comprehensive drive signal

VA: Pulse Width Modulation Potential

VC1: First control circuit

VC2: Second control circuit

VD1: First drive potential

VD2: Second drive potential

VD3: The third driving potential

VD4: Fourth drive potential

VE1: First operating potential

VE2: Second operating potential

VF: Feedback potential

VIN1: First input potential

VIN2: Second input potential

VM1: First communication potential

VM2: Second communication potential

VOUT: output voltage

VR: Rectification potential

VS: Induction Potential

VSS: Ground potential

FIG. 1 is a schematic diagram showing a power supply according to an embodiment of the present invention. FIG. 2 is a circuit diagram showing a power supply according to an embodiment of the present invention. FIG. 3 is an external view showing a power supply according to an embodiment of the present invention.

100: Power supply

110: Bridge rectifier

120: Transformer

121: Main coil

122: Secondary coil

130: Power switch

140: Output stage circuit

150: Feedback compensation circuit

160: Control circuit

164: Power transmission integrated circuit

170: Light generating circuit

175-1,175-2,175-N: Lights

SD: Comprehensive drive signal

VA: Pulse Width Modulation Potential

VC1: First control circuit

VF: Feedback potential

VIN1: first input potential

VIN2: Second input potential

VM1: First communication potential

VM2: Second communication potential

VOUT: output voltage

VR: Rectification potential

VS: Induction potential

VSS: ground potential

Claims (9)

A power supply supporting power transmission includes: a bridge rectifier, generating a rectified potential according to a first input potential and a second input potential; a transformer, including a main coil and a secondary coil, wherein the main coil is used to receive the rectified potential, and the secondary coil is used to generate an induced potential; a power switch, selectively coupling the main coil to a ground potential; an output stage circuit, generating an output potential according to the induced potential and a first control potential; a feedback compensation circuit, generating a feedback potential according to the output potential; a control circuit, including a power transmission integrated circuit, wherein the control circuit generates the pulse width modulation potential, the first control potential, and the second communication potential according to the feedback potential, a first communication potential, and a second communication potential. and a comprehensive driving signal; and a light generating circuit, generating one or more light signals according to the comprehensive driving signal, wherein the light signals correspond to the level of the output potential; wherein the comprehensive driving signal includes a first operating potential, a second operating potential, a first driving potential, a second driving potential, a third driving potential, and a fourth driving potential, and wherein the control circuit further includes: a micro The controller generates the pulse width modulation potential, the first control potential, and the first operating potential according to the feedback potential and a second control potential; wherein the power transmission integrated circuit generates the second control potential, the second operating potential, the first driving potential, the second driving potential, the third driving potential, and the fourth driving potential according to the first communication potential and the second communication potential. A power supply as claimed in claim 1, wherein the light generating circuit operates in an independent display mode, an extended display mode, or a flashing warning mode. A power supply as claimed in claim 1, wherein the bridge rectifier comprises: a first diode having an anode and a cathode, wherein the anode of the first diode is coupled to a first input node to receive the first input potential, and the cathode of the first diode is coupled to a first node to output the rectified potential; a second diode having an anode and a cathode, wherein the anode of the second diode is coupled to a second input node to receive the second input potential. potential, and the cathode of the second diode is coupled to the first node; a third diode having an anode and a cathode, wherein the anode of the third diode is coupled to the ground potential, and the cathode of the third diode is coupled to the first input node; and a fourth diode having an anode and a cathode, wherein the anode of the fourth diode is coupled to the ground potential, and the cathode of the fourth diode is coupled to the second input node. As the power supply of claim 3, the transformer further has a built-in excitation inductor, the main coil has a first end and a second end, the first end of the main coil is coupled to the first node to receive the rectified potential, the second end of the main coil is coupled to a second node, the excitation inductor has a first end and a second end, the first end of the excitation inductor is coupled to the first node, the second end of the excitation inductor is coupled to the second node, the secondary coil has a first end and a second end, the first end of the secondary coil is coupled to a third node to output the induced potential, and the second end of the secondary coil is coupled to a common node. A power supply as claimed in claim 4, wherein the power switch comprises: a first transistor having a control end, a first end, and a second end, wherein the control end of the first transistor is used to receive the pulse width modulation potential, the first end of the first transistor is coupled to the ground potential, and the second end of the first transistor is coupled to the second node. A power supply as claimed in claim 4, wherein the output stage circuit comprises: a fifth diode having an anode and a cathode, wherein the anode of the fifth diode is coupled to the third node to receive the induced potential, and the cathode of the fifth diode is coupled to a fourth node; a first capacitor having a first end and a second end, wherein the first end of the first capacitor is coupled to the fourth node, and the second end of the first capacitor is coupled to the common node; a second transistor having a A control terminal, a first terminal, and a second terminal, wherein the control terminal of the second transistor is used to receive the first control potential, the first terminal of the second transistor is coupled to an output node to selectively output the output potential, and the second terminal of the second transistor is coupled to the fourth node; and a second capacitor having a first terminal and a second terminal, wherein the first terminal of the second capacitor is coupled to the output node, and the second terminal of the second capacitor is coupled to the common node. A power supply as in claim 6, wherein the feedback compensation circuit comprises: a first resistor having a first end and a second end, wherein the first end of the first resistor is coupled to the output node to receive the output potential, and the second end of the first resistor is coupled to a fifth node; a second resistor having a first end and a second end, wherein the first end of the second resistor is coupled to the fifth node, and the second end of the second resistor is coupled to the common node; a third capacitor having a first end and a second end, wherein the first end of the third capacitor is coupled to a sixth node, and the second end of the third capacitor is coupled to the fifth node; a voltage regulator having an anode, a cathode, and a reference end, wherein the anode of the voltage regulator is coupled to the common node. The cathode of the voltage regulator is coupled to the sixth node, and the reference terminal of the voltage regulator is coupled to the fifth node; a linear optical coupler, comprising a light-emitting diode and a bipolar junction transistor, wherein the light-emitting diode has an anode and a cathode, the anode of the light-emitting diode is coupled to the output node, the cathode of the light-emitting diode is coupled to the sixth node, and the bipolar junction transistor is coupled to the fifth node. The junction transistor has a collector and an emitter, the collector of the bipolar junction transistor is used to output the feedback potential, and the emitter of the bipolar junction transistor is coupled to a seventh node; and a fourth capacitor has a first end and a second end, wherein the first end of the fourth capacitor is coupled to the seventh node, and the second end of the fourth capacitor is coupled to the ground potential. A power supply as claimed in claim 7, wherein the light generating circuit comprises: a third transistor having a control terminal, a first terminal, and a second terminal, wherein the control terminal of the third transistor is used to receive the first operating potential, the first terminal of the third transistor is coupled to a control node, and the second terminal of the third transistor is used to receive the pulse width modulation potential; a fourth transistor having a control terminal, a first terminal, and a second terminal, wherein the control terminal of the fourth transistor is used to receive the second operating potential, the first terminal of the fourth transistor is coupled to an eighth node, and the second terminal of the fourth transistor is coupled to the fifth node; and an amplifier having an input terminal and an output terminal, wherein the input terminal of the amplifier is coupled to the eighth node, and the output terminal of the amplifier is coupled to the control node. A power supply as claimed in claim 8, wherein the light generating circuit further comprises: a third resistor having a first end and a second end, wherein the first end of the third resistor is coupled to the output node, and the second end of the third resistor is coupled to a ninth node; a first light-emitting diode having an anode and a cathode, wherein the anode of the first light-emitting diode is coupled to the ninth node, and the cathode of the first light-emitting diode is coupled to a tenth node; a fifth transistor having a control terminal, a first terminal, and a second terminal, wherein the control terminal of the fifth transistor is used to receive the first driving potential, the first terminal of the fifth transistor is coupled to an eleventh node, and the second terminal of the fifth transistor is coupled to the tenth node; a sixth transistor, having a control terminal, a first terminal, and a second terminal, wherein the control terminal of the sixth transistor is coupled to the control node, the first terminal of the sixth transistor is coupled to the common node, and the a second end coupled to the eleventh node; a fourth resistor having a first end and a second end, wherein the first end of the fourth resistor is coupled to the output node, and the second end of the fourth resistor is coupled to a twelfth node; a second light-emitting diode having an anode and a cathode, wherein the anode of the second light-emitting diode is coupled to the twelfth node, and the cathode of the second light-emitting diode is coupled to a thirteenth node; a seventh transistor having a control end, a first end, and a second end, wherein the control end of the seventh transistor is used to receive the second driving potential, the first end of the seventh transistor is coupled to a fourteenth node, and the second end of the seventh transistor is coupled to the thirteenth node; an eighth transistor, having a control end, a first end, and a second end, wherein the control end of the eighth transistor is coupled to the control node, the first end of the eighth transistor is coupled to the common node, and the second end of the eighth transistor is coupled to the a fourth node; a fifth resistor having a first end and a second end, wherein the first end of the fifth resistor is coupled to the output node, and the second end of the fifth resistor is coupled to a fifteenth node; a third light-emitting diode having an anode and a cathode, wherein the anode of the third light-emitting diode is coupled to the fifteenth node, and the cathode of the third light-emitting diode is coupled to a sixteenth node; a ninth transistor having a control end, a first end, and a second end, wherein The control terminal of the ninth transistor is used to receive the third driving potential, the first terminal of the ninth transistor is coupled to a seventeenth node, and the second terminal of the ninth transistor is coupled to the sixteenth node; a tenth transistor, having a control terminal, a first terminal, and a second terminal, wherein the control terminal of the tenth transistor is coupled to the control node, the first terminal of the tenth transistor is coupled to the common node, and the second terminal of the tenth transistor is coupled to the seventeenth node; A a sixth resistor having a first end and a second end, wherein the first end of the sixth resistor is coupled to the output node, and the second end of the sixth resistor is coupled to an eighteenth node; a fourth light-emitting diode having an anode and a cathode, wherein the anode of the fourth light-emitting diode is coupled to the eighteenth node, and the cathode of the fourth light-emitting diode is coupled to a nineteenth node; an eleventh transistor having a control end, a first end, and a second end, wherein the eleventh transistor The control terminal of the transistor is used to receive the fourth driving potential, the first terminal of the eleventh transistor is coupled to a twentieth node, and the second terminal of the eleventh transistor is coupled to the nineteenth node; and a twelfth transistor having a control terminal, a first terminal, and a second terminal, wherein the control terminal of the twelfth transistor is coupled to the control node, the first terminal of the twelfth transistor is coupled to the common node, and the second terminal of the twelfth transistor is coupled to the twentieth node.

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