Docking station circuit with stable output voltage and equipment

Abstract

The invention discloses a docking station circuit and equipment with stable output voltage, the docking station circuit comprises a power supply module, a voltage conversion module, an energy storage unit and a protection unit, the power supply module is used for receiving voltage transmitted by a first external power supply or a second external power supply; the voltage conversion module is used for adjusting the voltage transmitted by the power supply module and transmitting the voltage to external equipment; the energy storage unit is used for transmitting working voltage required by external equipment when the first external power supply is switched to the second external power supply; and the protection unit is used for transmitting the voltage output by the energy storage unit to the voltage conversion module when the first external power supply is switched to the second external power supply and the voltage of the second voltage input end is lower than the voltage of the second voltage output end, so as to maintain the rated voltage of the voltage conversion module to be transmitted to the external equipment. The design can solve the problem that equipment connected with the docking station cannot work normally when the external power supply is switched.

Description

Technical Field

[0001] The present application relates to the field of expansion docks, and in particular to an expansion dock circuit and device with a stable output voltage. Background Art

[0002] A docking station is a hardware device used to connect a portable device (such as a laptop) to multiple external devices (such as a monitor, keyboard, mouse, storage device, etc.) to expand its functionality. Through interfaces such as USB and Type-C, the docking station can provide higher data transfer rates, video output, and power supply, and support multiple display outputs, network connections, and external storage devices.

[0003] Since the Type-C interface supports power transmission, video transmission, and USB3.2 data transmission at the same time, an external Type-C docking station is required to realize these functions at the same time. When using a Type-C docking station, the external power supply can charge the laptop through the Type-C interface on the docking station. At this time, the docking station is also connected to other peripherals. At this time, the external power supply supplies power to the peripherals. If the external power supply is unplugged at this time, the laptop will start to supply power to the docking station and peripherals. However, due to the power supply switching, there will be a power supply transition time, which is usually 150uS. However, since the internal resistance of the docking station consumes power and its USB port needs to supply power to the outside, the voltage sent from the USB may not reach the minimum limit of the rated voltage, and the peripherals cannot work normally in a short time, and even cause shutdown and restart; therefore, a capacitor is usually added to the circuit of the docking station on the market for energy storage. When the power is switched, the voltage is output to the docking station and peripherals to keep the peripherals connected to the docking station working normally.

[0004] But the problem is that during the power switching period (FRS), the external power supply has been unplugged and cannot power the docking station and peripherals, and the power supply of the laptop has not been sent out. Usually, the voltage of the power supply is 5V, but the load on the 5V main circuit of the docking station is still consuming power, causing the energy of the energy storage capacitor to be consumed and the voltage to drop. In order to maintain the 5V output, the internal power supply circuit of the docking station will absorb current from the power interface of the docking station. However, at this time, because the laptop computer and the external power supply do not have enough energy to provide, if the load is heavy, the voltage in the power supply circuit will continue to drop due to the absorption of a large current. When the voltage is lower than the undervoltage protection voltage of Buck-Boost (in the docking station) (usually between 2.5 and 4V), the Buck-Boost circuit will perform undervoltage lockout and shut down the output for several milliseconds. At this time, the docking station will have no function during the Buck-Boost undervoltage lockout period, resulting in abnormal function of the docking station, seriously affecting the user experience. Summary of the invention

[0005] In order to solve the technical defects raised in the above-mentioned background technology, the embodiment of the present application provides a docking station circuit with a stable output voltage, which can effectively solve the problem that the device connected to the docking station cannot work normally due to the switching of the external power supply.

[0006] The present invention adopts the following technical solution:

[0007] In a first aspect, the present application provides an expansion dock circuit with a stable output voltage, including a power supply module, a voltage conversion module, an energy storage unit and a protection unit, the power supply module having a first voltage input terminal, a second voltage input terminal and a first voltage output terminal, the first voltage input terminal is electrically connected to a first external power supply, the second voltage input terminal is electrically connected to the second external power supply, the power supply module is used to receive the voltage transmitted by the first external power supply or the second external power supply; the voltage conversion module has a third voltage input terminal and a second voltage output terminal, the third voltage input terminal is electrically connected to the first voltage output terminal, the voltage conversion module is used to convert the voltage transmitted by the power supply module into The energy storage unit is electrically connected to the voltage conversion module, and the output end of the energy storage unit is grounded. The energy storage unit is used to deliver the working voltage required by the external device when the first external power supply is switched to the second external power supply. The protection unit is connected in series between the voltage conversion module and the energy storage unit. The protection unit is used to deliver the voltage output by the energy storage unit to the voltage conversion module when the first external power supply is switched to the second external power supply and the voltage at the second voltage input end is lower than the voltage at the second voltage output end. The protection unit is used to deliver the voltage output by the energy storage unit to the voltage conversion module to maintain the rated voltage of the voltage conversion module for delivery to the external device.

[0008] Optionally, the protection unit includes:

[0009] a first current limiting resistor, wherein a first end of the first current limiting resistor is electrically connected to the second voltage output end, and a second end of the first current limiting resistor is electrically connected to the energy storage unit, and the first current limiting resistor is used to limit current when the voltage conversion module charges the energy storage unit;

[0010] A first diode, wherein the anode of the first diode is electrically connected to the output end of the energy storage unit, and the cathode is electrically connected to the third voltage input end, and the first diode is used to turn on and transmit the voltage of the energy storage unit to the third voltage input end when the first external power supply is switched to the second external power supply and the voltage transmitted by the second voltage input port is less than the voltage required by the external device.

[0011] Optionally, the protection unit further includes:

[0012] a second current limiting resistor, wherein a first end of the second current limiting resistor is electrically connected to the third voltage input end, and a second end of the second current limiting resistor is electrically connected to the energy storage unit;

[0013] A second diode, wherein a cathode of the second diode is electrically connected to the second voltage output terminal, and an anode of the second diode is electrically connected to the energy storage unit.

[0014] Optionally, the first diode and the second diode are both Schottky diodes.

[0015] Optionally, the energy storage unit includes an electrolytic capacitor, a positive electrode of the electrolytic capacitor is electrically connected to the anode of the first diode, and a negative electrode of the electrolytic capacitor is grounded.

[0016] Optionally, the voltage conversion module includes

[0017] A first filtering unit, wherein one end of the first filtering unit is electrically connected to the first voltage output end, and the other end of the first filtering unit is grounded;

[0018] A voltage conversion chip, wherein the voltage conversion chip is electrically connected to the first filtering unit;

[0019] an inductor, wherein a first end of the inductor is electrically connected to the voltage conversion chip, and a second end of the inductor is electrically connected to an external device;

[0020] A second filtering unit, wherein one end of the second filtering unit is electrically connected to the second end of the inductor, and the other end of the second filtering unit is grounded.

[0021] Optionally, the first filtering unit includes at least one first filtering capacitor, one end of the at least one filtering capacitor is electrically connected to the first voltage output end, and the other end is grounded.

[0022] The second filtering unit includes at least one second filtering capacitor, one end of the at least one second filtering capacitor is electrically connected to the second end of the inductor, and the other end is grounded.

[0023] Optionally, the voltage conversion module further includes:

[0024] a first NMOS transistor, wherein a drain of the first NMOS transistor is electrically connected to the output end of the first filtering unit, a source of the first NMOS transistor is electrically connected to the first end of the inductor, and a gate is electrically connected to the voltage conversion chip;

[0025] A second NMOS tube, wherein the drain of the second NMOS tube is electrically connected to the input end of the second filtering unit, the source of the second NMOS tube is electrically connected to the second end of the inductor, and the gate is electrically connected to the voltage conversion chip.

[0026] Optionally, the voltage conversion module also includes at least one USB port, at least two Type-C interfaces and at least one HDMI interface, and at least two of the Type-C interfaces are electrically connected to the first voltage input port and the second voltage input port in sequence.

[0027] In a second aspect, the present application further provides a docking station device with a stable output voltage, comprising the docking station circuit with a stable output voltage as claimed in claim 1;

[0028] a housing having a built-in space;

[0029] A circuit board, the expansion dock circuit with a stable output voltage is recorded on the circuit board, and the circuit board is arranged in the housing

[0030] In summary, the beneficial effects of the present invention are:

[0031] By setting up a power supply module, the voltage of the first external power supply and the second external power supply can be connected, and the voltage delivered by the power supply module is adjusted through the voltage conversion module so as to meet the voltage required by the external device. The energy storage unit can deliver the corresponding voltage to the external device during the switching between the first external power supply and the second external power supply to prevent the external device from being powered off or malfunctioning during the switching between the first external power supply and the second external power supply. The voltage in the energy storage unit is then introduced into the voltage conversion module through the protection unit, which can prevent the voltage conversion module from delivering part of the electric energy to the voltage conversion module due to insufficient voltage provided by the power supply module, so that the second voltage output terminal of the voltage conversion module can deliver the rated voltage to the external device, thereby preventing the voltage conversion module from entering the undervoltage lockout state due to insufficient voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 is an architectural diagram of an embodiment of the present invention;

[0034] Figure 2 is a schematic diagram of an embodiment of the present invention;

[0035] Figure 3 is another schematic diagram of an embodiment of the present invention;

[0036] Figure 4is a schematic diagram of a power module according to an embodiment of the present invention;

[0037] Figure 5 4 is a schematic diagram of a voltage conversion module according to an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 100, power module; V1, first voltage input terminal; V2, second voltage input terminal; C1, first capacitor; Q1, first PMOS tube; R1, first resistor; R2, second resistor; Q3, third NMOS tube; R3, third resistor; C2, second capacitor; Q2, second PMOS tube; R4, fourth resistor; R5, fifth resistor; Q4, fourth NMOS tube; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor;

[0040] 200, voltage conversion module; V3, third voltage input terminal; V4, second voltage output terminal; Q5, first NMOS tube; Q6, second NMOS tube; 210, first filter unit; 220, second filter unit; L1, inductor; U1, voltage conversion chip;

[0041] 300, energy storage unit; EC1, electrolytic capacitor;

[0042] 400, protection unit; RD1, first current limiting resistor; RD2, second current limiting resistor; D1, first diode; D2, second diode. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0044] like Figure 1As shown, an embodiment of the present invention provides an expansion dock circuit with a stable output voltage, including a power module 100, a voltage conversion module 200, an energy storage unit 300 and a protection unit 400, the power module 100 has a first voltage input terminal V1, a second voltage input terminal V2 and a first voltage output terminal, the first voltage input terminal V1 is electrically connected to a first external power supply, the second voltage input terminal V2 is electrically connected to the second external power supply, the power module 100 is used to receive a voltage transmitted by the first external power supply or the second external power supply; the third voltage input terminal V3 is electrically connected to the first voltage output terminal, the voltage conversion module 200 is used to adjust the voltage transmitted by the power module 100 and transmit it to an external device; the energy storage unit The input end of the energy storage unit 300 is electrically connected to the voltage conversion module 200, and the output end of the energy storage unit 300 is grounded. The energy storage unit 300 is used to transmit the working voltage required by the external device when the first external power supply is switched to the second external power supply; the protection unit 400 is connected in series between the voltage conversion module 200 and the energy storage unit 300. The protection unit 400 is used to transmit the voltage output by the energy storage unit 300 to the voltage conversion module 200 when the first external power supply is switched to the second external power supply and the voltage of the second voltage input terminal V2 is lower than the voltage of the second voltage output terminal V4. The protection unit 400 transmits the rated voltage of the voltage conversion module 200 to the external device.

[0045] In an embodiment of the present application, the first voltage input terminal V1 of the power module 100 can be connected to an external power source, such as a charger, a charging power supply, etc., and the second voltage input terminal V2 can be connected to a laptop computer or an electronic device with a Type-C interface, and the embodiment of the present application can have two or more Type-C interfaces. Therefore, in the present application, not only can the voltage transmitted by the first voltage input terminal V1 be used to charge or communicate with the device connected to the present application, but the voltage transmitted by the second voltage input terminal V2 can also be used to charge the electronic device connected to the present application. Further, the power module 100 may include a first capacitor C1, a first PMOS tube Q1, a first resistor R1, a second resistor R2, a third NMOS tube Q3, a third resistor R3, a second capacitor C2, a second PMOS tube Q2, a fourth resistor R4, a fifth resistor R5, a fourth NMOS tube Q4, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. The first end of the first capacitor C1 is electrically connected to the first voltage input terminal V1, and the second end is grounded; the drain of the first PMOS tube Q1 is electrically connected to the first voltage input terminal V1, the source is electrically connected to the first end of the seventh resistor R7, the gate is electrically connected to the first end of the first resistor R1, the first end of the second resistor R2 is electrically connected to the second end of the first resistor R1, the drain of the third NMOS tube Q3 is electrically connected to the second end of the second resistor R2, the gate is electrically connected to the control end of the external circuit, the source of the third NMOS tube Q3 is grounded, and the first end of the third resistor R3 is electrically connected to the first control end of the external circuit and the third NMOS tube Q3. The first end of the second capacitor C2 is electrically connected to the second voltage input terminal V2, and the second end is grounded. The drain of the second PMOS tube Q2 is electrically connected to the second voltage input terminal V2, the source of the second PMOS tube Q2 is electrically connected to the first end of the eighth resistor R8, the gate of the second PMOS tube Q2 is electrically connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is electrically connected to the first end of the fifth resistor R5, the second end of the fifth resistor R5 is electrically connected to the drain of the fourth NMOS tube Q4, the gate of the fourth NMOS tube Q4 is electrically connected to the second control end of the external circuit, the source of the fourth NMOS tube Q4 is grounded, the first end of the seventh resistor R7 is electrically connected to the source of the first PMOS tube Q1, the second end of the seventh resistor R7 is electrically connected to the first end of the second resistor R2, the first end of the eighth resistor R8 is electrically connected to the source of the second PMOS tube Q2, and the second end of the eighth resistor R8 is electrically connected to the first end of the fifth resistor R5. By providing the above-mentioned power supply module 100, after the first external power supply is disconnected, the second external power supply can be switched to supply power to the present application and the electronic device connected to the present application.

[0046] Further, such as Figure 5As shown, the voltage conversion module 200 may have a third voltage input terminal V3 and a second voltage output terminal V4, the third voltage input terminal V3 is electrically connected to the first voltage output terminal, and the second voltage output terminal V4 is connected to an external device, specifically, it may be connected to the VBUS pin (power pin) in the USB interface, and the voltage conversion module 200 adjusts the voltage provided by the power module 100 to a voltage level suitable for use by the external device, and ensures stable output of the voltage. Since the voltage delivered by the external power supply and electronic devices such as notebooks cannot meet the power requirements of many external devices, the voltage conversion module 200 can be set to adjust the voltage accordingly, and then the corresponding voltage is output through the second voltage output terminal V4, so that the external device can be powered.

[0047] Further, such as Figure 3 As shown, the energy storage unit 300 has a positive electrode and a negative electrode (the positive electrode is the input terminal, and the negative electrode is the output terminal), wherein the positive electrode is electrically connected to the second voltage output terminal V4, and the negative electrode is grounded. By setting the energy storage unit 300, the external device connected to the present application will not be temporarily powered off during the period when the first external power supply is switched to the second external power supply, thereby ensuring the normal operation of the external device. However, during the period when the first external power supply is switched to the second external power supply, if the external load is large, the current in the energy storage unit 300 will be absorbed, and the components in the voltage conversion module 200 will also consume a part of the electric energy. Therefore, in order to maintain the 5V output, the voltage conversion module 200 will absorb current from the second external power supply. However, when the second external power supply does not have sufficient voltage support, the voltage in the voltage conversion module 200 will be reduced, even lower than the preset voltage, wherein the preset voltage can be 5V, which will cause the voltage conversion module 200 to perform undervoltage protection, thereby shutting down the output for several mS, so the external device connected to the present application will have no voltage supply within these mS, which will cause the external device to shut down, etc., seriously affecting the user experience. Therefore, by setting the protection unit 400, when the first external power source is switched to the second external power source, and the voltage of the second voltage input terminal V2 is lower than the voltage of the second voltage output terminal V4, the protection unit 400 enables the voltage output by the energy storage unit 300 to be transmitted to the voltage conversion module 200, so as to maintain the rated voltage of the voltage conversion module 200 and transmit it to the external device. In other words, the energy storage unit 300 will transmit a part of the current to the voltage conversion module 200, so that the voltage conversion module 200 can provide a part of the voltage to the voltage conversion module 200 when dealing with a large external load, preventing the voltage conversion module 200 from entering the undervoltage protection state, and further preventing the external device from shutting down due to insufficient voltage, thereby improving the user experience.

[0048] Optional, such as Figure 2As shown, the protection unit 400 includes a first current limiting resistor RD1 and a first diode D1. The first end of the first current limiting resistor RD1 is electrically connected to the second voltage output terminal V4, and the second end is electrically connected to the energy storage unit 300. The first current limiting resistor RD1 is used to limit the current when the voltage conversion module 200 charges the energy storage unit 300; the anode of the first diode D1 is electrically connected to the output end of the energy storage unit 300, and the cathode is electrically connected to the third voltage input terminal V3. The first diode D1 is used to turn on and transmit the voltage of the energy storage unit 300 to the third voltage input terminal V3 when the first external power supply is switched to the second external power supply and the voltage transmitted by the second voltage input terminal V2 is less than the voltage required by the external device.

[0049] In the embodiment of the present application, the first end of the first current limiting resistor RD1 is electrically connected to the second voltage output terminal V4 of the voltage conversion module 200, the second end of the first current limiting resistor RD1 is electrically connected to the positive electrode of the energy storage unit 300, the anode of the first diode D1 is electrically connected to the second end of the first current limiting resistor RD1 and the positive electrode of the energy storage capacitor, respectively, and the cathode of the first diode D1 is electrically connected to the third voltage input terminal V3 of the voltage conversion module 200. By setting the first current limiting resistor RD1, it is possible to limit the current of the energy storage unit 300 when the first external power supply or the second external power supply inputs a voltage, thereby providing power to the energy storage unit 300; by setting the first diode D1, during the switching between the first external power supply and the second external power supply, the first diode D1 can divide the voltage in the energy storage unit 300 to the voltage conversion module 200, thereby preventing the voltage conversion module 200 from being over-discharged and entering an undervoltage state, and maintaining the second voltage output terminal V4 in the voltage conversion module 200 to maintain a normal 5V output, thereby providing the required power to the external device.

[0050] Optional, such as Figure 2 As shown, the protection unit 400 may also include a second current limiting resistor RD2 and a second diode D2, the first end of the second current limiting resistor RD2 is electrically connected to the third voltage input terminal V3, and the second end of the second current limiting resistor RD2 is electrically connected to the energy storage unit 300; the cathode of the second diode D2 is electrically connected to the second voltage output terminal V4, and the anode of the second diode D2 is electrically connected to the energy storage unit 300.

[0051] In the embodiment of the present application, the first end of the second current limiting resistor RD2 is electrically connected to the third voltage input terminal V3, the second end is electrically connected to the input terminal of the energy storage unit 300, the anode of the second diode D2 is electrically connected to the energy storage unit 300, and the cathode is electrically connected to the third voltage output terminal. By setting the second current limiting resistor RD2 and the second diode D2, it is possible to prevent the load from being carried when the load of the external device is too high. Specifically, when the first external power supply or the external device is overloaded, the first current limiting resistor RD1 and the second current limiting resistor RD2 can prevent the load of the external device from being too high. Among them, the first diode D1 and the second diode D2 can use low-voltage drop Schottky diodes, and the resistance values ​​of the first current limiting resistor RD1 and the second current limiting resistor RD2 can be between 100R and 100K, so as to ensure that the voltage on the positive electrode of the energy storage unit 300 is maintained between 5.3V and 6V.

[0052] Optionally, the energy storage unit 300 may include an electrolytic capacitor EC1 having a positive electrode and a negative electrode. The positive electrode of the electrolytic capacitor EC1 is electrically connected to the anode of the first diode D1 , and the negative electrode of the electrolytic capacitor EC1 is grounded.

[0053] Optional, such as Figure 5 As shown, the voltage conversion module 200 includes a first filtering unit 210, an inductor L1 and a second filtering unit 220, one end of the first filtering unit 210 is electrically connected to the first voltage output end, and the other end is grounded; a voltage conversion chip U1, the voltage conversion chip U1 is electrically connected to the first filtering unit 210; the first end of the inductor L1 is electrically connected to the voltage conversion chip U1, and the second end is electrically connected to an external device; one end of the second filtering unit 220 is electrically connected to the second end of the inductor L1, and the other end is grounded.

[0054] Optionally, the voltage conversion module 200 further includes a first NMOS tube Q5 and a second NMOS tube Q6, wherein the drain of the first NMOS tube Q5 is electrically connected to the output end of the first filtering unit 210, the source of the first NMOS tube Q5 is electrically connected to the first end of the inductor L1, and the gate is electrically connected to the voltage conversion chip U1; the drain of the second NMOS tube Q6 is electrically connected to the input end of the second filtering unit 220, the source of the second NMOS tube Q6 is electrically connected to the second end of the inductor L1, and the gate is electrically connected to the voltage conversion chip U1.

[0055] In the embodiment of the present application, one end of the above-mentioned first filtering unit 210 is electrically connected to the first voltage output end, and the other end is grounded. At the same time, the voltage of the first voltage output end is transmitted to the 20th pin of the voltage conversion chip U1 through one end of the first filtering unit 210, and at the same time, the drain of the first NMOS tube Q5 is also electrically connected to one end of the first filtering unit 210, the source of the first NMOS tube Q5 is electrically connected to the first end of the inductor L1, the gate of the first NMOS tube Q5 is electrically connected to the 18th pin of the voltage conversion chip U1, the source of the second NMOS tube Q6 is electrically connected to the second end of the inductor L1, the gate is electrically connected to the 9th pin of the voltage conversion chip U1, the drain of the second NMOS tube Q6 is electrically connected to the 7th pin of the voltage conversion chip U1, and one end of the second filtering unit 220 is electrically connected to the drain of the second NMOS tube Q6. The voltage of the third voltage input terminal V3 is filtered by setting the first filtering unit 210, and the output voltage of the second terminal of the inductor L1 is filtered by the second filtering unit 220, so that the voltage delivered by the electrolytic capacitor EC1 and the protection unit 400 can be filtered and smoothed.

[0056] Optionally, the voltage conversion module 200 also includes at least one USB port, at least two Type-C interfaces and at least one HDMI interface, and at least two of the Type-C interfaces are electrically connected to the first voltage input terminal V1 and the second voltage input terminal V2 in sequence.

[0057] In an embodiment of the present application, the above-mentioned USB port is used for external devices, such as a mouse, a keyboard, etc., and there are two Type-C interfaces, the first of which is a port to which the first voltage input terminal V1 is electrically connected, and the second is a port to which the second voltage input terminal V2 is connected. The first voltage input terminal V1 is usually connected to an external power supply, and the second voltage input terminal V2 is usually connected to a laptop computer or other electronic device with a Type-C interface. The above-mentioned HDMI interface is used to connect an audio display device.

[0058] The second aspect of the present application proposes a docking station device with a stable output voltage (not shown in the figure), including the docking station circuit with a stable output voltage, a housing and a circuit board as described above, wherein the housing has a built-in space; the docking station circuit with a stable output voltage is recorded on the circuit board, and the circuit board is arranged in the housing. By arranging the above electronic device, it is possible to prevent the external device connected to the docking station device from shutting down or causing other functional failures due to untimely voltage transmission during the switching between the first external power supply and the second external power supply.

[0059] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0060] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A docking station circuit with a stable output voltage, characterized in that: include: A power module, having a first voltage input terminal, a second voltage input terminal and a first voltage output terminal, wherein the first voltage input terminal is electrically connected to a first external power source, the second voltage input terminal is electrically connected to the second external power source, and the power module is used to receive a voltage transmitted by the first external power source or the second external power source; A voltage conversion module, having a third voltage input terminal and a second voltage output terminal, wherein the third voltage input terminal is electrically connected to the first voltage output terminal, and the voltage conversion module is used to adjust the voltage delivered by the power supply module and deliver it to an external device; An energy storage unit, wherein an input end of the energy storage unit is electrically connected to the voltage conversion module, an output end of the energy storage unit is grounded, and the energy storage unit is used to deliver a working voltage required by an external device when the first external power source is switched to the second external power source; A protection unit is connected in series between the voltage conversion module and the energy storage unit. The protection unit is used to transmit the voltage output by the energy storage unit to the voltage conversion module when the first external power supply is switched to the second external power supply and the voltage at the second voltage input terminal is lower than the voltage at the second voltage output terminal, so as to maintain the rated voltage of the voltage conversion module for transmission to the external device.

2. The expansion dock circuit with a stable output voltage as claimed in claim 1, characterized in that , the protection unit comprises: a first current limiting resistor, wherein a first end of the first current limiting resistor is electrically connected to the second voltage output end, and a second end of the first current limiting resistor is electrically connected to the energy storage unit, and the first current limiting resistor is used to limit current when the voltage conversion module charges the energy storage unit; A first diode, wherein the anode of the first diode is electrically connected to the output end of the energy storage unit, and the cathode is electrically connected to the third voltage input end, and the first diode is used to turn on and transmit the voltage of the energy storage unit to the third voltage input end when the first external power supply is switched to the second external power supply and the voltage transmitted by the second voltage input port is less than the voltage required by the external device.

3. The expansion dock circuit with a stable output voltage as claimed in claim 2, characterized in that: The protection unit also includes: a second current limiting resistor, wherein a first end of the second current limiting resistor is electrically connected to the third voltage input end, and a second end of the second current limiting resistor is electrically connected to the energy storage unit; A second diode, wherein a cathode of the second diode is electrically connected to the second voltage output terminal, and an anode of the second diode is electrically connected to the energy storage unit.

4. The expansion dock circuit with a stable output voltage as claimed in claim 3, characterized in that , the first diode and the second diode are both Schottky diodes.

5. The expansion dock circuit with a stable output voltage as claimed in claim 1, characterized in that: The energy storage unit includes an electrolytic capacitor, a positive electrode of the electrolytic capacitor is electrically connected to the anode of the first diode, and a negative electrode of the electrolytic capacitor is grounded.

6. The expansion dock circuit with a stable output voltage as claimed in claim 1, characterized in that: The voltage conversion module comprises: A first filtering unit, wherein one end of the first filtering unit is electrically connected to the first voltage output end, and the other end of the first filtering unit is grounded; A voltage conversion chip, wherein the voltage conversion chip is electrically connected to the first filtering unit; an inductor, wherein a first end of the inductor is electrically connected to the voltage conversion chip, and a second end of the inductor is electrically connected to an external device; A second filtering unit, wherein one end of the second filtering unit is electrically connected to the second end of the inductor, and the other end of the second filtering unit is grounded.

7. The expansion dock circuit with a stable output voltage as claimed in claim 6, characterized in that: The first filtering unit includes at least one first filtering capacitor, one end of the at least one filtering capacitor is electrically connected to the first voltage output end, and the other end is grounded. The second filtering unit includes at least one second filtering capacitor, one end of the at least one second filtering capacitor is electrically connected to the second end of the inductor, and the other end is grounded.

8. The expansion dock circuit with a stable output voltage as claimed in claim 7, characterized in that: The voltage conversion module also includes: a first NMOS transistor, wherein a drain of the first NMOS transistor is electrically connected to the output end of the first filtering unit, a source of the first NMOS transistor is electrically connected to the first end of the inductor, and a gate is electrically connected to the voltage conversion chip; A second NMOS tube, wherein the drain of the second NMOS tube is electrically connected to the input end of the second filtering unit, the source of the second NMOS tube is electrically connected to the second end of the inductor, and the gate is electrically connected to the voltage conversion chip.

9. The expansion dock circuit with a stable output voltage as claimed in claim 1, characterized in that: The voltage conversion module also includes at least one USB port, at least two Type-C interfaces and at least one HDMI interface, and at least two of the Type-C interfaces are electrically connected to the first voltage input port and the second voltage input port in sequence.

10. A docking station device with a stable output voltage, characterized in that: A docking station circuit with a stable output voltage as claimed in any one of claims 1 to 9; a housing having a built-in space; A circuit board, the expansion dock circuit with a stable output voltage is engraved on the circuit board, and the circuit board is arranged in the housing.

Images