CN220190893U - Power supply circuit and KVM switch - Google Patents
Power supply circuit and KVM switch Download PDFInfo
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- CN220190893U CN220190893U CN202320997288.9U CN202320997288U CN220190893U CN 220190893 U CN220190893 U CN 220190893U CN 202320997288 U CN202320997288 U CN 202320997288U CN 220190893 U CN220190893 U CN 220190893U
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Abstract
The utility model discloses a power supply circuit and a KVM switch, wherein the power supply circuit comprises an audio-video interface module, a first current limiting module and a USB downlink interface module, one end of the audio-video interface module is electrically connected with the input end of the first current limiting module, the output end of the first current limiting module is electrically connected with one end of the USB downlink interface module, the other end of the audio-video interface module is used for being connected with audio-video equipment, and the other end of the USB downlink interface module is used for being connected with power consumption equipment. Therefore, the current of the audio and video equipment connected with the audio and video interface module can be limited through the first current limiting module, and then the current is supplied to the power consumption equipment connected with the USB downlink interface module, so that the damage probability of the audio and video equipment can be reduced under the condition that the audio and video equipment externally connected with the audio and video interface is independently powered and connected with the power consumption equipment with larger power consumption, and the first current limiting module can play a role in protecting the power consumption equipment from overcurrent and short circuit, and the safety and stability in the power supply process are improved.
Description
Technical Field
The present utility model relates to the field of power supply circuits, and in particular, to a power supply circuit and a KVM switch.
Background
Currently, the KVM switch on the market generally has no independent power interface, and can only access power from an external device connected to the USB upstream interface or the audio/video interface of the KVM switch, for example, from a computer.
However, it is found in practice that when the KVM switch does not support power access from the audio/video interface and only when the audio/video interface is connected to an external device (such as a display), the KVM switch has no power supply source and cannot work normally; in order to solve the problem that the KVM switch does not support power taking from the audio/video interface, the current KVM switch mostly supports power taking from the audio/video interface, but when power taking is only performed from the audio/video equipment connected with the audio/video interface, if the USB downlink interface is connected with a power consumption equipment (such as a hard disk) with a larger load, the audio/video equipment connected with the audio/video interface will be damaged due to the fact that the power consumption equipment needs a larger current. Therefore, the power supply circuit capable of reducing the damage of the audio and video equipment in the power supply process and improving the safety and stability in the power supply process is particularly important.
Disclosure of Invention
The utility model provides a power supply circuit and a KVM switch, which can reduce the damage probability of audio and video equipment, play a role in protecting overcurrent and short circuit of the power consumption equipment and improve the safety and stability in the power supply process under the condition that the audio and video equipment externally connected with an audio and video interface is used for independently supplying power and is connected with the power consumption equipment with larger power consumption.
To solve the above technical problem, a first aspect of the present utility model discloses a power supply circuit, which includes:
the system comprises an audio-video interface module, a first current limiting module and a USB downlink interface module;
one end of the audio/video interface module is electrically connected with the input end of the first current limiting module, and the output end of the first current limiting module is electrically connected with one end of the USB downlink interface module;
the other end of the audio/video interface module is used for being connected with audio/video equipment, and the other end of the USB downlink interface module is used for being connected with power consumption equipment;
the audio/video interface module is used for taking power from the audio/video equipment and providing the power to the power consumption equipment through the USB downlink interface module;
the first current limiting module is used for limiting the current provided to the power consumption equipment to a first preset current.
As an optional implementation manner, in the first aspect of the present utility model, the first current limiting module includes a first current limiting chip and a first current limiting resistor;
one end of the audio/video interface module is electrically connected with a power supply pin end of the first current limiting chip, an output pin end of the first current limiting chip is electrically connected with one end of the USB downlink interface module, one end of the first current limiting resistor is electrically connected with a current limiting pin end of the first current limiting chip, and the other end of the first current limiting resistor is used for being grounded.
As an optional implementation manner, in the first aspect of the present utility model, the power supply circuit further includes a second current limiting module and a first boost module;
one end of the audio/video interface module is electrically connected with the input end of the second current limiting module, the output end of the second current limiting module is electrically connected with the input end of the first boosting module, and the output end of the first boosting module is electrically connected with the input end of the first current limiting module;
the second current limiting module is used for limiting the current provided to the first boosting module to a second preset current;
the first boosting module is used for boosting the voltage provided for the power consumption equipment to a first preset voltage.
As an optional implementation manner, in the first aspect of the present utility model, the second current limiting module includes a second current limiting chip and a second current limiting resistor;
one end of the audio/video interface module is electrically connected with a power supply pin end of the second current limiting chip, an output pin end of the second current limiting chip is electrically connected with an input end of the first boosting module, one end of the second current limiting resistor is electrically connected with a current limiting pin end of the second current limiting chip, and the other end of the second current limiting resistor is used for being grounded.
As an optional implementation manner, in the first aspect of the present utility model, the power supply circuit further includes a first voltage isolation module;
the first voltage isolation module comprises a first diode;
the positive electrode of the first diode is electrically connected with one end of the audio/video interface module, and the negative electrode of the first diode is electrically connected with the input end of the second current limiting module;
the first voltage isolation module is used for preventing current from flowing from the power consumption equipment to the audio/video equipment.
As an optional implementation manner, in the first aspect of the present utility model, the power supply circuit further includes a USB upstream interface module and a second boost module;
one end of the USB uplink interface module is electrically connected with the input end of the second boosting module after being connected with one end of the audio/video interface module in parallel, the output end of the second boosting module is electrically connected with the power supply pin end of the first current limiting chip, and one end of the USB uplink interface module is electrically connected with the enabling pin end of the first current limiting chip;
the other end of the USB uplink interface module is used for being connected with external equipment;
the USB uplink interface module is used for taking power from the external equipment and providing the power to the power consumption equipment; the second boosting module is used for boosting the voltage provided for the power consumption equipment to a second preset voltage.
As an optional implementation manner, in the first aspect of the present utility model, the power supply circuit further includes a second voltage isolation module, a third voltage isolation module, and a fourth voltage isolation module;
the second voltage isolation module comprises a second diode, the third voltage isolation module comprises a third diode, and the fourth voltage isolation module comprises a fourth diode;
the anode of the second diode is electrically connected with one end of the audio/video interface module, the anode of the third diode is electrically connected with one end of the USB uplink interface module, and the cathode of the second diode is electrically connected with the input end of the second boosting module after being connected with the cathode of the third diode in parallel;
the positive electrode of the fourth diode is electrically connected with one end of the USB uplink interface module, and the other end of the fourth diode is electrically connected with the enabling pin end of the first current limiting chip;
the second voltage isolation module is used for preventing current from flowing from the power consumption device to the audio/video device, the third voltage isolation module is used for preventing current from flowing from the power consumption device to the external device, and the fourth voltage isolation module is used for preventing current from flowing from the enabling pin end of the first current limiting chip to the external device.
The second aspect of the present utility model discloses a KVM switch, which includes a port including one or more of a USB-C output port, an HDMI input port, an HDMI ring outlet, and a microphone port, and a power supply circuit according to any one of the first aspect of the present utility model, wherein the port is disposed on the power supply circuit.
The implementation of the utility model has the following beneficial effects:
the utility model discloses a power supply circuit, which comprises an audio-video interface module, a first current limiting module and a USB downlink interface module, wherein one end of the audio-video interface module is electrically connected with the input end of the first current limiting module, the output end of the first current limiting module is electrically connected with one end of the USB downlink interface module, the other end of the audio-video interface module is used for being connected with audio-video equipment, and the other end of the USB downlink interface module is used for being connected with power consumption equipment; the audio/video interface module is used for taking power from the audio/video equipment and providing the power to the power consumption equipment through the USB downlink interface module, and the first current limiting module is used for limiting the current provided to the power consumption equipment to a first preset current. Therefore, the current of the audio and video equipment connected with the audio and video interface module can be limited through the first current limiting module, and then the current is supplied to the power consumption equipment connected with the USB downlink interface module, the first current limiting module can protect the power consumption equipment from overcurrent and short circuit, and the situation that the audio and video equipment is damaged can be reduced under the condition that the power consumption of the power consumption equipment is large, so that the safety and the stability in the power supply process are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a power supply circuit according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a first current limiting module according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of another power supply circuit according to an embodiment of the present utility model;
fig. 4 is a schematic structural diagram of a boost module according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of a second current limiting module according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a power supply circuit according to another embodiment of the present utility model;
FIG. 7 is a schematic diagram of a power supply circuit according to another embodiment of the present utility model;
FIG. 8 is a schematic diagram of a power supply circuit according to another embodiment of the present utility model;
FIG. 9 is a schematic diagram of a power supply circuit according to another embodiment of the present utility model;
FIG. 10 is a schematic diagram of a KVM switch according to an embodiment of the present utility model.
Detailed Description
For a better understanding and implementation, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that, unless explicitly specified and limited otherwise, the term "electrically connected" in the description of the utility model and in the claims and in the above-mentioned figures should be understood in a broad sense, for example, as a fixed electrical connection, as a removable electrical connection, or as an integral electrical connection; can be mechanically and electrically connected or can be mutually communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. Furthermore, the terms first, second and the like in the description and in the claims of the utility model and in the foregoing figures, are used for distinguishing between different objects and not for describing a particular sequential order, and are not intended to cover any exclusive inclusion. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Example 1
Referring to fig. 1, fig. 1 is a schematic diagram of a power supply circuit according to an embodiment of the utility model. The power supply circuit shown in fig. 1 may be applied to a KVM switch (Keyboard Video Mouse Switch) or other devices or apparatuses that need power supply, which is not limited in the embodiment of the present utility model.
As shown in fig. 1, the power supply circuit may include an audio/video interface module 101, a first current limiting module 102, and a USB downstream interface module 103; one end of the audio/video interface module 101 is electrically connected with the input end of the first current limiting module 102, and the output end of the first current limiting module 102 is electrically connected with one end of the USB downlink interface module 103; the other end of the audio/video interface module 101 is used for being connected with an audio/video device 104, and the other end of the USB downlink interface module 103 is used for being connected with a power consumption device 105.
In the embodiment of the present utility model, the audio/video interface module 101 is configured to take power from the audio/video device 104 and provide the power to the power consumption device 105 through the USB downlink interface module 103; the first current limiting module 102 is configured to limit a current provided to the power consumption device 105 to a first preset current. The first preset current is a current capable of ensuring normal operation of the power consumption device 105 connected to the USB downlink interface module 103, and the magnitude of the first preset current may be adjusted, preferably, the first preset current may be 2A.
In this embodiment, optionally, the audio/video device 104 connected to the audio/video interface module 101 may be an audio device, such as a sound device; or may be a display device such as a display; but also a display device with integrated audio functionality. Alternatively, the power consumption device connected to the USB downlink interface module 103 may include a hard disk, a sound device, and the like, which is not limited by the embodiment of the present utility model.
Therefore, the power supply circuit described in fig. 1 is implemented to limit the current of the audio and video device connected to the audio and video interface module through the first current limiting module, and then the current is provided to the power consumption device connected to the USB downlink interface module, where the first current limiting module can protect the power consumption device from overcurrent and short circuit, and can reduce the damage of the audio and video device and improve the safety and stability in the power supply process under the condition of larger power consumption of the power consumption device.
IN an alternative embodiment, as shown IN fig. 2, fig. 2 is a schematic structural diagram of a first current limiting module disclosed IN the embodiment of the present utility model, as shown IN fig. 2, the first current limiting module includes a first current limiting chip U1 and a first resistor R1, where the first current limiting chip may be a SY6280 type chip, as shown IN fig. 2, a power supply pin IN of the first current limiting chip U1 is electrically connected to one end of the audio/video interface module, an output pin OUT of the first current limiting chip U1 is electrically connected to one end of the USB downlink interface module, a current limiting pin FLT of the first current limiting chip U1 is electrically connected to one end of the first resistor R1, and the other end of the first resistor R1 is used for grounding.
In this alternative embodiment, as shown in fig. 2, the first current limiting module further includes a resistor R2 and a resistor R3, where one end of the resistor R2 is electrically connected to the enable pin end EN of the first current limiting chip U1, and the other end of the resistor R2 is used for grounding; one end of the resistor R3 is electrically connected with an enabling voltage source, and the other end of the resistor R3 is electrically connected with an enabling pin end EN of the first current limiting chip U1. The enabling voltage source is used for providing enabling voltage for the first current limiting chip U1; the resistor R2 is used for dividing the voltage provided by the enabling voltage source to the first current limiting chip U1 into rated working voltage of the first current limiting chip U1; the resistor R3 is used for limiting the current flowing into the enable pin end EN of the first current limiting chip U1 to prevent the first current limiting chip U1 from being damaged when the current is too high, and preferably, the rated operating voltage may be 3.3V.
In this alternative embodiment, the first current limiting module may further include a capacitor for filtering, and the connection relationship of the capacitor is shown in fig. 2.
In another alternative embodiment, as shown in fig. 3, the power supply circuit further includes a second current limiting module 106 and a first voltage boosting module 107;
one end of the audio/video interface module 101 is electrically connected with the input end of the second current limiting module 106, the output end of the second current limiting module 106 is electrically connected with the input end of the first boosting module 107, and the output end of the first boosting module 107 is electrically connected with the input end of the first current limiting module 102;
wherein the second current limiting module 106 is configured to limit the current provided to the first voltage boosting module 107 to a second preset current;
the first boost module 107 is configured to limit a voltage provided to the power consumption device to a first preset voltage.
In this alternative embodiment, as shown in fig. 3, fig. 3 is a schematic structural diagram of another power supply circuit disclosed in the embodiment of the present utility model, where, optionally, the second preset current may be a maximum rated current that can be output by the audio and video device, and preferably, the second preset current may be 0.5A. Alternatively, the first preset voltage may be a rated voltage capable of enabling the power consumption device to operate, or a rated output voltage of the USB interface, and preferably, the first preset voltage may be 5V.
In this alternative embodiment, the first boost module includes a boost chip, and a plurality of capacitors, inductors, and resistors around the boost chip, where the boost chip may be a SY7069B type boost chip. The first boost module and the electrical connection relationship between the electronic components in the first boost module may be shown in fig. 4, and fig. 4 is a schematic structural diagram of the boost module disclosed in the embodiment of the present utility model.
Therefore, according to the alternative embodiment, the second current limiting module is arranged to limit the current input by the audio and video equipment to the maximum rated current which can be output by the audio and video equipment, so that the risk of damage to the audio and video equipment in the power supply process is further reduced, and the voltage provided for the power consumption equipment is boosted to the rated output voltage of the USB interface through the first boosting module, so that the safety and stability in the power supply process are further improved.
In yet another alternative embodiment, as shown in fig. 5, fig. 5 is a schematic structural diagram of a second current limiting module disclosed in the embodiment of the present utility model, and as shown in fig. 5, the second current limiting module includes a second current limiting chip U2 and a second current limiting resistor R4;
one end of the audio/video interface module is electrically connected with a power supply pin end IN of the second current limiting chip U2, an output pin end OUT of the second current limiting chip U2 is electrically connected with an input end of the first boosting module, one end of the second current limiting resistor R4 is electrically connected with a current limiting pin end FLT of the second current limiting chip U2, and the other end of the second current limiting resistor R4 is used for being grounded.
In this alternative embodiment, as shown in fig. 5, the second current limiting module further includes a resistor R5 and a resistor R6, where one end of the resistor R5 is electrically connected to the enable pin end EN of the first current limiting chip U1, and the other end of the resistor R5 is used for grounding; one end of the resistor R6 is electrically connected with an enabling voltage source, and the other end of the resistor R6 is electrically connected with an enabling pin end EN of the first current limiting chip U2. The enabling voltage source is used for providing enabling voltage for the first current limiting chip U2; a resistor R5 for limiting the voltage provided by the enabling voltage source; the resistor R6 is configured to divide the voltage provided by the enabling voltage source to the first current-limiting chip U1 into a rated operating voltage of the first current-limiting chip U1, and preferably, the rated operating voltage may be 3.3V.
In this alternative embodiment, the first current limiting module may further include a capacitor for filtering and a resistor for dividing voltage, and the connection relationship of the capacitor and the resistor is shown in fig. 5.
In yet another alternative embodiment, as shown in fig. 6, fig. 6 is a schematic structural diagram of yet another power supply circuit disclosed in an embodiment of the present utility model, where the power supply circuit further includes a first voltage isolation module 108, and the first voltage isolation module 108 includes a first diode;
the positive electrode of the first diode is electrically connected with one end of the audio/video interface module 101, and the negative electrode of the first diode is electrically connected with the input end of the second current limiting module 106;
the first voltage isolation module 108 is configured to prevent current from flowing from the power consumption device 105 to the audio/video device 104.
It can be seen that this alternative embodiment, through setting up first voltage isolation module, utilizes the unidirectional conduction effect of diode, restricts the direction of electric current, has reduced the risk that audio-visual equipment received the damage in the power supply process.
In yet another alternative embodiment, as shown in fig. 7, fig. 7 is a schematic structural diagram of yet another power supply circuit disclosed in an embodiment of the present utility model, where the power supply circuit further includes a USB upstream interface module 109 and a second boost module 110;
one end of the USB uplink interface module 109 is electrically connected with the input end of the second boost module 110 after being connected with one end of the audio/video interface module 101 in parallel, the output end of the second boost module 110 is electrically connected with the power supply pin end of the first current limiting chip, and one end of the USB uplink interface module 109 is electrically connected with the enable pin end of the first current limiting chip;
the other end of the USB upstream interface module 109 is used to connect with an external device 111;
the USB uplink interface module 109 is configured to take power from the external device 111 and provide the power to the power consumption device 105; the second boost module 110 is configured to boost the voltage provided to the power consumption device 105 to a second preset voltage.
In this alternative embodiment, as shown in fig. 2, one end of the USB upstream interface module is electrically connected to the enable pin EN of the first current limiting chip U1 through the diode D1 by VBUS.
In this alternative embodiment, the external device connected to the USB upstream interface module may be a computer device, a storage device, or other electronic devices, which is not limited in the embodiment of the present utility model.
In this alternative embodiment, the second preset voltage may be a rated voltage that enables the power consumption device to operate, or a rated output voltage of the USB interface, and preferably, the second preset voltage may be 5V.
In this alternative embodiment, the second boost module includes a boost chip, and a plurality of capacitors, inductors, and resistors around the boost chip, where the boost chip may be a SY7069B type boost chip. The second voltage boosting module and the electrical connection relationship between the electronic components in the second voltage boosting module can be shown in fig. 4.
Therefore, the optional embodiment can ensure sufficient voltage when the external equipment of the USB uplink interface supplies power for the power consumption equipment, and is electrically connected with the enabling pin end of the first current limiting chip through the USB uplink interface module, and the first current limiting chip is not enabled when the external equipment of the USB uplink interface does not supply power for the power consumption equipment, so that the power supply of the USB downlink interface module is cut off, the safety of the audio/video equipment externally connected with the audio/video interface module can be effectively ensured, and the safety and stability in the power supply process are further improved.
In yet another alternative embodiment, as shown in fig. 8, fig. 8 is a schematic structural diagram of yet another power supply circuit disclosed in an embodiment of the present utility model, where the power supply circuit further includes a second voltage isolation module 112, a third voltage isolation module 113, and a fourth voltage isolation module 114;
the second voltage isolation module 112 includes a second diode, the third voltage isolation module 113 includes a third diode, and the fourth voltage isolation module 114 includes a fourth diode;
the positive electrode of the second diode is electrically connected with one end of the audio/video interface module 101, the positive electrode of the third diode is electrically connected with one end of the USB uplink interface module 109, and the negative electrode of the second diode is electrically connected with the input end of the second boost module 110 after being connected with the negative electrode of the third diode in parallel; the positive electrode of the fourth diode is electrically connected with one end of the USB uplink interface module 109, and the other end of the fourth diode is electrically connected with the enabling pin end of the first current limiting chip;
the second voltage isolation module 112 is used for preventing current from flowing from the power consumption device to the audio/video device, the third voltage isolation module 113 is used for preventing current from flowing from the power consumption device to the external device, and the fourth voltage isolation module 114 is used for preventing current from flowing from the enable pin end of the first current limiting chip to the external device.
Therefore, the voltage isolation module is arranged at the USB uplink interface module and the audio/video interface module, the unidirectional conduction function of the diode is utilized to limit the direction of current, the condition that the low voltage is high-load and the components of the circuit are damaged when the input voltage is inconsistent is effectively reduced, and the safety of the equipment is ensured.
In yet another alternative embodiment, as shown in fig. 9, fig. 9 is a schematic structural diagram of a power supply circuit according to another embodiment of the present utility model, where one end of the audio/video interface module 101 is electrically connected to an input end of the second voltage isolation module 112, an output end of the second voltage isolation module 112 is electrically connected to an input end of the second current limiting module 106, one end of the USB upstream interface module 109 is electrically connected to an input end of the third voltage isolation module 113, and an output end of the second current limiting module 106 is electrically connected to an input end of the second voltage boost module 110 after being connected in parallel with an output end of the third voltage isolation module 113.
Therefore, according to the alternative embodiment, the audio and video equipment externally connected with the audio and video interface module and the external equipment externally connected with the USB uplink interface module can supply power to the power consumption equipment externally connected with the USB downlink interface module at the same time, when the audio and video equipment externally connected with the audio and video interface module only supplies power to the power consumption equipment externally connected with the USB downlink interface module, the first current limiting module and the second current limiting module play roles in overcurrent and short-circuit protection on the power consumption equipment, so that when the power consumption of the power consumption equipment is larger, the probability of damaging the audio and video equipment is reduced, and the safety and stability in the power supply process are further improved.
Example two
Referring to fig. 10, fig. 10 is a schematic diagram of a KVM switch according to an embodiment of the utility model, wherein the KVM switch includes a port including one or more of a USB-C output port, an HDMI input port, an HDMI ring outlet and a microphone port, and further includes a power supply circuit as in the first embodiment, and the port is disposed on the power supply circuit. It should be noted that, for the detailed description of the power supply circuit, please refer to the detailed description of the related content in the first embodiment, and the detailed description of the embodiment is omitted.
Therefore, the KVM switch illustrated in fig. 10 can limit the current of the audio/video device connected to the audio/video interface module through the first current limiting module, and then provide the current to the power consumption device connected to the USB downstream interface module, where the first current limiting module can protect the power consumption device from overcurrent and short circuit, and can reduce damage to the audio/video device and improve safety and stability during power supply under the condition of high power consumption of the power consumption device.
The power supply circuit and the KVM switch disclosed in the embodiments of the present utility model are described in detail, and specific embodiments are applied to illustrate the principles and implementation of the present utility model, but the preferred embodiments are not intended to limit the present utility model, and the description of the embodiments is only used to help understand the method and the core idea of the present utility model; also, it is apparent to those skilled in the art from this disclosure that many changes can be made in this embodiment and this application without departing from the spirit and scope of the utility model, which is set forth in the following claims.
Claims (8)
1. A power supply circuit, the power supply circuit comprising:
the system comprises an audio-video interface module, a first current limiting module and a USB downlink interface module;
one end of the audio/video interface module is electrically connected with the input end of the first current limiting module, and the output end of the first current limiting module is electrically connected with one end of the USB downlink interface module;
the other end of the audio/video interface module is used for being connected with audio/video equipment, and the other end of the USB downlink interface module is used for being connected with power consumption equipment;
the audio/video interface module is used for taking power from the audio/video equipment and providing the power to the power consumption equipment through the USB downlink interface module;
the first current limiting module is used for limiting the current provided to the power consumption equipment to a first preset current.
2. The power supply circuit of claim 1, wherein the first current limiting module comprises a first current limiting chip and a first current limiting resistor;
one end of the audio/video interface module is electrically connected with a power supply pin end of the first current limiting chip, an output pin end of the first current limiting chip is electrically connected with one end of the USB downlink interface module, one end of the first current limiting resistor is electrically connected with a current limiting pin end of the first current limiting chip, and the other end of the first current limiting resistor is used for being grounded.
3. The power supply circuit of claim 1 or 2, further comprising a second current limiting module and a first boost module;
one end of the audio/video interface module is electrically connected with the input end of the second current limiting module, the output end of the second current limiting module is electrically connected with the input end of the first boosting module, and the output end of the first boosting module is electrically connected with the input end of the first current limiting module;
the second current limiting module is used for limiting the current provided to the first boosting module to a second preset current;
the first boosting module is used for boosting the voltage provided for the power consumption equipment to a first preset voltage.
4. The power supply circuit of claim 3, wherein the second current limiting module comprises a second current limiting chip and a second current limiting resistor;
one end of the audio/video interface module is electrically connected with a power supply pin end of the second current limiting chip, an output pin end of the second current limiting chip is electrically connected with an input end of the first boosting module, one end of the second current limiting resistor is electrically connected with a current limiting pin end of the second current limiting chip, and the other end of the second current limiting resistor is used for being grounded.
5. The power supply circuit of claim 3, further comprising a first voltage isolation module;
the first voltage isolation module comprises a first diode;
the positive electrode of the first diode is electrically connected with one end of the audio/video interface module, and the negative electrode of the first diode is electrically connected with the input end of the second current limiting module;
the first voltage isolation module is used for preventing current from flowing from the power consumption equipment to the audio/video equipment.
6. The power supply circuit of claim 2, further comprising a USB upstream interface module and a second boost module;
one end of the USB uplink interface module is electrically connected with the input end of the second boosting module after being connected with one end of the audio/video interface module in parallel, the output end of the second boosting module is electrically connected with the power supply pin end of the first current limiting chip, and one end of the USB uplink interface module is electrically connected with the enabling pin end of the first current limiting chip;
the other end of the USB uplink interface module is used for being connected with external equipment;
the USB uplink interface module is used for taking power from the external equipment and providing the power to the power consumption equipment; the second boosting module is used for boosting the voltage provided for the power consumption equipment to a second preset voltage.
7. The power supply circuit of claim 6, further comprising a second voltage isolation module, a third voltage isolation module, and a fourth voltage isolation module;
the second voltage isolation module comprises a second diode, the third voltage isolation module comprises a third diode, and the fourth voltage isolation module comprises a fourth diode;
the anode of the second diode is electrically connected with one end of the audio/video interface module, the anode of the third diode is electrically connected with one end of the USB uplink interface module, and the cathode of the second diode is electrically connected with the input end of the second boosting module after being connected with the cathode of the third diode in parallel;
the positive electrode of the fourth diode is electrically connected with one end of the USB uplink interface module, and the other end of the fourth diode is electrically connected with the enabling pin end of the first current limiting chip;
the second voltage isolation module is used for preventing current from flowing from the power consumption device to the audio/video device, the third voltage isolation module is used for preventing current from flowing from the power consumption device to the external device, and the fourth voltage isolation module is used for preventing current from flowing from the enabling pin end of the first current limiting chip to the external device.
8. A KVM switch comprising a port comprising one or more of a USB-C output port, an HDMI input port, an HDMI ring outlet, and a microphone port, wherein the KVM switch further comprises a power supply circuit of any of claims 1-7, and wherein the port is disposed on the power supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320997288.9U CN220190893U (en) | 2023-04-24 | 2023-04-24 | Power supply circuit and KVM switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320997288.9U CN220190893U (en) | 2023-04-24 | 2023-04-24 | Power supply circuit and KVM switch |
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| Publication Number | Publication Date |
|---|---|
| CN220190893U true CN220190893U (en) | 2023-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320997288.9U Active CN220190893U (en) | 2023-04-24 | 2023-04-24 | Power supply circuit and KVM switch |
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| Country | Link |
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| CN (1) | CN220190893U (en) |
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