Bimodal video conference terminal equipment power supply control device

Abstract

The utility model discloses a bimodal video conference terminal equipment power supply control device, which relates to the technical field of network communication and comprises a latch U1, a conference operation indicating lamp D1, a light emitting diode D2, a triode Q1, a triode Q2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a photoelectric coupler OC, a diode D3 and a relay K. According to the utility model, the current working state of the video conference terminal equipment can be detected, if the video conference terminal equipment is in a conference running state, the conference mode switching operation is forbidden, and if the video conference terminal equipment is in a conference ending state, the conference mode switching operation is enabled. Therefore, the use flexibility of the power supply control device is improved, a user is allowed to switch the conference modes easily according to needs, and the safety and practicability of the device are maintained at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of network communications, and in particular to a power supply control device for dual-mode video conferencing terminal equipment. Background Art

[0002] Emergency management, disaster relief, and other departments urgently need a dual-mode video conferencing terminal device with the following three features:

[0003] Feature 1: Integrates all peripheral components including display, camera, microphone, speaker, control keyboard, battery, etc., is lightweight and easy to carry;

[0004] Feature 2: It can hold both non-confidential video conferences over public communication networks and confidential video conferences over confidential dedicated lines, with both types of video conferencing components (including both software and hardware) integrated within the same video conferencing terminal device.

[0005] Feature 3: Switch between non-confidential and encrypted conference modes on demand. The video conferencing terminal device can only operate in one conference mode at a time, and the two types of video conferences must be physically isolated.

[0006] To achieve these features, non-confidential and confidential video conferencing components can share the following components: video input and output devices such as cameras and displays; audio input and output devices such as microphones and speakers; command input devices such as control keyboards; and real-time audio and video information processing devices such as processors, volatile memory, and motherboards. Furthermore, power supply components such as lithium-ion batteries and battery charging and discharging circuits will also power these components. These components do not retain any conference-related information after power is removed.

[0007] To ensure secure switching between modes and maintain information confidentiality, both the non-confidential and confidential video conferencing components must be equipped with independent non-volatile memories to store their respective video conferencing software, as well as video conferencing-related configuration information, status information, key information, or other persistent information. These non-volatile memories operate during power-up and maintain stored information upon power failure. Special power control methods are also required, ensuring data security when switching between different conferencing modes.

[0008] Therefore, the lack of physical isolation and independent storage design may lead to the leakage of confidential information. In the absence of physical isolation, data from non-confidential meetings may be accidentally stored or accessed in the storage of confidential meetings, resulting in the leakage of sensitive information. At the same time, if the conference mode cannot be switched on demand, users may need additional equipment to handle communication requirements of different security levels, which not only increases costs but also affects the convenience of operation.

[0009] Currently, no effective solutions have been proposed for the problems in related technologies. Utility Model Content

[0010] In response to the problems in the related art, the present invention proposes a power supply control device for dual-mode video conferencing terminal equipment to overcome the above-mentioned technical problems existing in the existing related art.

[0011] To this end, the specific technical solutions adopted in this utility model are as follows:

[0012] A power supply control device for a dual-mode video conferencing terminal device, comprising a latch U1, a conference operation indicator light D1, a light-emitting diode D2, a transistor Q1, a transistor Q2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a photocoupler OC, a diode D3, and a relay K;

[0013] The first pin of the latch U1 is connected to the tenth pin and grounded, the eleventh pin of the latch U1 is respectively connected to one end of the resistor R2 and the collector of the transistor Q1, and the other end of the resistor R2 is connected to the 5V digital power supply; the base of the transistor Q1 is respectively connected to the positive electrode of the conference operation indicator D1 and INNER_CIRUIT through the resistor R1, the negative electrode of the conference operation indicator D1 is grounded, and the emitter of the transistor Q1 is grounded; the eighteenth pin of the latch U1 is connected to the video conferencing terminal mode switching device MODE_SW, the nineteenth pin of the latch U1 is connected to the positive electrode of the light-emitting diode D2, the negative electrode of the light-emitting diode D2 is connected to the first pin of the photoelectric coupler OC through the resistor R3, the second pin of the photoelectric coupler OC is grounded, and the The third pin is connected to the base of the transistor Q2 via the resistor R4, the collector of the transistor Q2 is connected to the fourth pin of the relay K and the anode of the diode D3 respectively, the cathode of the diode D3 is connected to the third pin of the relay K and the fourth pin of the optocoupler OC respectively and connected to the 5V analog power supply; the first pin of the relay K is connected to the power input interface SEC_MEETING_POW of the confidential meeting mode non-volatile memory, the second pin of the relay K is connected to the power input interface PUB_MEETING_POW of the non-confidential meeting mode non-volatile memory, the fifth pin of the relay K is connected to the power supply device POW_DEVICE, the emitter of the transistor Q2 is grounded, and the twentieth pin of the latch U1 is connected to the 5V digital power supply.

[0014] Furthermore, both the transistor Q1 and the transistor Q2 are NPN transistors.

[0015] Furthermore, when the eleventh pin of the latch U1 is at a low level, the level output of the nineteenth pin changes synchronously with the level of the eighteenth pin. At this time, the output level of the nineteenth pin always remains consistent with the input level of the eighteenth pin.

[0016] Furthermore, the relay K is a single-pole double-throw relay, and the relay K is used to implement power switching between the power supply device and the non-volatile memory.

[0017] Furthermore, when the current is conducted between the third pin and the fourth pin of relay K, the magnetic core of relay K produces an adsorption action, causing the fifth pin of relay K to be disconnected from the second pin, and the fifth pin of relay K to be closed to the first pin, and the power supply device POW_DEVICE is disconnected from the power input interface PUB_MEETING_POW of the non-volatile memory of the non-confidential video conferencing component, and at the same time connected to the power input interface SEC_MEETING_POW of the non-volatile memory of the confidential video conferencing component.

[0018] Furthermore, the operating voltage of the non-volatile memory is 5V, and the power input interface of the non-volatile memory is a SATA power interface.

[0019] Furthermore, the power supply device is used to provide a 5V voltage, and the maximum supply current of the power supply device is less than or equal to 5A.

[0020] The beneficial effects of the utility model are:

[0021] 1. The present invention provides power to the non-volatile memory of the corresponding component (non-confidential video conferencing component or confidential video conferencing component) according to the current non-confidential video conferencing mode or confidential video conferencing mode, and at the same time cuts off the power supply to the non-volatile memory of another component, thereby ensuring that within a time period, the video conferencing terminal device can only run one conference mode, and any persistent information of the two types of video conferencing is kept physically isolated, thereby ensuring that any sensitive information will not be accessed by unauthorized modes, thereby enhancing the security of the information.

[0022] 2. The utility model can detect the current working status of the video conferencing terminal device. If the video conferencing terminal device is in the conference running state, the conference mode switching operation must be prohibited. If the video conferencing terminal device is in the conference ending state, the conference mode switching operation is enabled, thereby not only improving the flexibility of use of the power supply control device, allowing users to easily switch conference modes as needed, but also maintaining the safety and practicality of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a circuit schematic diagram of a power supply control device for a dual-mode video conferencing terminal device according to an embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the power input interface pins of a non-volatile memory in a power supply control device for a dual-mode video conferencing terminal device according to an embodiment of the present utility model;

[0026] Figure 3 The present invention is a schematic diagram of the power output interface pins of a power supply device in a power supply control device for a dual-mode video conferencing terminal device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. By referring to these contents, ordinary technicians in this field should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0028] According to an embodiment of the present utility model, a power supply control device for a dual-mode video conferencing terminal device is provided.

[0029] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. Figure 1-Figure 3 As shown, according to an embodiment of the present invention, a power supply control device for a dual-mode video conferencing terminal device includes a latch U1, a conference operation indicator light D1, a light-emitting diode D2, a transistor Q1, a transistor Q2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a photocoupler OC, a diode D3, and a relay K;

[0030] The first pin of the latch U1 is connected to the tenth pin and grounded. The eleventh pin of the latch U1 is respectively connected to one end of the resistor R2 and the collector of the transistor Q1, and the other end of the resistor R2 is connected to the 5V digital power supply; the base of the transistor Q1 is respectively connected to the positive electrode of the conference operation indicator D1 and INNER_CIRUIT (INNER_CIRUIT represents all functional circuits located inside the dual-mode video conferencing terminal device for realizing confidential video conferencing functions and non-confidential video conferencing functions. INNER_CIRUIT is a general term and an abbreviation here) through the resistor R1. The negative electrode of the conference operation indicator D1 is grounded, and the emitter of the transistor Q1 is grounded; the eighteenth pin of the latch U1 is connected to the video conferencing terminal mode switching device MODE_SW, the nineteenth pin of the latch U1 is connected to the positive electrode of the light-emitting diode D2, and the negative electrode of the light-emitting diode D2 is connected. The first pin of relay K is connected to the first pin of photocoupler OC via resistor R3, the second pin of photocoupler OC is grounded, the third pin of photocoupler OC is connected to the base of transistor Q2 via resistor R4, the collector of transistor Q2 is connected to the fourth pin of relay K and the positive electrode of diode D3 respectively, the cathode of diode D3 is connected to the third pin of relay K and the fourth pin of photocoupler OC respectively and connected to a 5V analog power supply; the first pin of relay K is connected to the power input interface SEC_MEETING_POW of the confidential meeting mode non-volatile memory, the second pin of relay K is connected to the power input interface PUB_MEETING_POW of the non-confidential meeting mode non-volatile memory, the fifth pin of relay K is connected to the power supply device POW_DEVICE, the emitter of transistor Q2 is grounded, and the twentieth pin of latch U1 is connected to a 5V digital power supply.

[0031] In one embodiment, both transistor Q1 and transistor Q2 are NPN transistors.

[0032] In one embodiment, when the eleventh pin of the latch U1 is at a low level, the level output of the nineteenth pin changes synchronously with the level of the eighteenth pin. At this time, the output level of the nineteenth pin always remains consistent with the input level of the eighteenth pin.

[0033] In one embodiment, the relay K is a single-pole double-throw relay, and the relay K is used to implement power switching between the power supply device and the non-volatile memory.

[0034] In one embodiment, when current is conducted between the third pin and the fourth pin of relay K, the magnetic core of relay K generates an adsorption action, causing the fifth pin of relay K to be disconnected from the second pin, and the fifth pin of relay K to be closed to the first pin, and the power supply device POW_DEVICE is disconnected from the power input interface PUB_MEETING_POW of the non-volatile memory of the non-confidential video conferencing component, and at the same time connected to the power input interface SEC_MEETING_POW of the non-volatile memory of the confidential video conferencing component.

[0035] In one embodiment, the operating voltage of the non-volatile memory is 5V, and the power input interface of the non-volatile memory is a SATA power interface. The power supply device is used to provide 12V voltage, 5V voltage and 3.3V voltage, and the maximum power supply of the power supply device is less than or equal to 5A.

[0036] Specifically, the circuit principle of the power supply control device described in the present invention is as follows: Figure 1 As shown in the figure, the connection relationship and working principle between the components are as follows:

[0037] (1) Meeting operation indicator D1:

[0038] In this circuit, the conference status indicator D1 is used to indicate the conference status. When the video conferencing terminal device is in the conference running state, the conference running indicator is always on, and the positive pin voltage of the conference running indicator D1 is high. When the video conferencing terminal device is in the conference ending state, the conference running indicator is always off, and the positive pin voltage of the conference running indicator D1 is low.

[0039] (2) Transistor Q1:

[0040] Transistor Q1 is an NPN transistor that acts as an inverter in this circuit. Its base is connected to the positive pin of conference operation indicator D1 via resistor R1 (current-limiting resistor), and its voltage level is the same as that of the positive pin of conference operation indicator D1. Its collector is connected to the positive 5V digital power supply via resistor R2 (pull-up resistor), and its voltage level is opposite to that of the positive pin of conference operation indicator D1. The emitter of transistor Q1 is grounded.

[0041] The operating principle of the transistor Q1 is: when the base of the transistor Q1 is at a low level, the emitter is cut off, and the collector is at a high level; when the base of the transistor Q1 is at a high level, the emitter is turned on, and the collector is at a low level.

[0042] (3) Latch U1:

[0043] Latch U1, a 74LS373 latch, functions as a latch in this circuit. Pin 8D (equivalent to pin 18) of latch U1 is a status input pin, connected to the video conferencing terminal's mode switch, MODE_SW, to select the conferencing mode indicated by MODE_SW (a high level indicates secure video conferencing mode, a low level indicates non-secure video conferencing mode). Pin 8Q (equivalent to pin 19) of latch U1 is an output pin, connected to optocoupler OC to control the operation of relay K. Pin C+ (equivalent to pin 11) of latch U1 is a latch control pin, connected to the collector of transistor Q1. The output state of pin 8Q is controlled by the collector voltage level of transistor Q1.

[0044] The operating principle of latch U1 is: when the C+ pin is at a low level, the 8Q output pin is in a locked state. At this time, no matter how the input level of the 8D pin changes, the output level of the 8Q pin remains in its original state (high level or low level), which is equivalent to prohibiting the conference mode switching operation; when the C+ pin is at a low level, the level output of the 8Q output pin changes synchronously with the level of the 8D input pin. At this time, the output level of the 8Q pin is always consistent with the input level of the 8D pin (high level or low level), which is equivalent to enabling the conference mode switching operation.

[0045] (4) Optocoupler OC:

[0046] In this circuit, the optocoupler OC isolates the digital control circuit from the analog action circuit. Pins 1 and 2 of the optocoupler OC are digital inputs. Pin 1 is connected to the 8Q output pin of latch U1 via current-limiting resistor R3 and light-emitting diode D2, while pin 2 is grounded. Pins 3 and 4 of the optocoupler OC are analog outputs. Pin 3 is connected to the base of transistor Q2 via current-limiting resistor R4, while pin 4 is connected to the positive 5V analog power supply.

[0047] The operating principle of the optocoupler OC is: when the 8Q output pin of the latch U1 is at a high level, the light-emitting diode D2 is lit, the optocoupler OC receives the light from the light-emitting diode D2, and then turns on the analog output pins 3 and 4 of the optocoupler OC.

[0048] (5) Transistor Q2:

[0049] Transistor Q2 is an NPN transistor that controls the relay in this circuit. Its base is connected to the third pin of the optocoupler OC via resistor R4 (a current-limiting resistor), and its voltage level is the same as that of the third pin of the optocoupler OC. Its collector is connected to relay K, and its emitter is grounded.

[0050] The operating principle of transistor Q2 is as follows: when the photocoupler OC is turned on, the third pin of the photocoupler OC is at a high level, the base of transistor Q2 is at a high level, the emitter is turned on, and current is conducted through the third and fourth pins of relay K. The magnetic core of relay K produces an adsorption action, causing the fifth pin of relay K to be disconnected from the second pin, and the fifth pin of relay K to be closed to the first pin;

[0051] When the photocoupler OC is cut off, the third pin of the photocoupler OC is at a low level, the base of the transistor Q2 is at a low level, the emitter is cut off, the current through the third and fourth pins of the relay K is interrupted, the magnetic core of the relay K stops adsorption, the fifth pin of the relay K is disconnected from the first pin, and the fifth pin of the relay K is closed to the second pin.

[0052] (6) Relay K:

[0053] Relay K is a single-pole, double-throw relay that switches power between one power supply and two non-volatile memories in this circuit. Pins 3 and 4 of relay K are control pins, used to connect switching control signals. Pin 5 of relay K is the power input common pin, connected to the power supply POW_DEVICE. Pins 1 and 2 of relay K are power output pins. Pin 1 connects to the power input of the non-volatile memory in secure conferencing mode, and pin 2 connects to the power input of the non-volatile memory in non-secure conferencing mode.

[0054] The operating principle of relay K is: when the current is conducted between the third pin and the fourth pin of relay K, the magnetic core of relay K produces an adsorption action, causing the fifth pin of relay K to be disconnected from the second pin, and the fifth pin of relay K to be closed to the first pin, and the power supply device POW_DEVICE is disconnected from the power input interface PUB_MEETING_POW of the non-volatile memory of the non-confidential video conferencing component, and connected to the power input interface SEC_MEETING_POW of the non-volatile memory of the confidential video conferencing component. At this time, the conference terminal device can turn on the confidential video conferencing mode, can hold confidential video conferences, but cannot hold non-confidential video conferences.

[0055] When the current between the third and fourth pins of relay K is interrupted, the magnetic core of relay K stops its adsorption action, causing the fifth pin of relay K to be disconnected from the first pin, and the fifth pin of relay K to be closed to the second pin. The power supply device POW_DEVICE is disconnected from the power input interface SEC_MEETING_POW of the non-volatile memory of the confidential video conferencing component, and connected to the power input interface PUB_MEETING_POW of the non-volatile memory of the non-confidential video conferencing component. At this time, the conference terminal device can turn on the non-confidential video conferencing mode and hold non-confidential video conferences, but cannot hold confidential video conferences.

[0056] Specifically, the two non-volatile memories of the video conferencing terminal device have an operating voltage of 5V and a power input interface using a standard SATA power interface. The power input interface pin definition is as follows: Figure 2 This utility model only uses the 5V pin and the GND pin, and the 12V pin and the 3.3V pin are both vacant.

[0057] Specifically, a set of power supply components for video conferencing terminal equipment can provide voltages such as 12V, 5V, and 3.3V, with a maximum supply current not exceeding 5A. The power output interface adopts a D-type 4-pin interface, and the power output interface pin definition is as follows: Figure 3 The present invention only uses the 5V pin and the GND pin, and the 12V pin is left vacant. The power supply control device provided by the present invention is located between the power supply device and the non-volatile memory.

[0058] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in actual process is described in detail below.

[0059] In practical application:

[0060] (1) Video conferencing terminal equipment working status detection function:

[0061] ① When the video conferencing terminal device is in the conference running state, the conference running indicator light is always on, and the positive pin voltage of the conference running indicator light D1 is high level.

[0062] At this time, the base of transistor Q1 is at a high level, the emitter is turned on, and the collector is at a low level;

[0063] At this time, the C+ pin of the latch U1 is at a low level, and the 8Q pin of the latch is in a latched state, always keeping the original output level state of the pin unchanged;

[0064] At this time, conference mode switching operations are prohibited.

[0065] ② When the video conferencing terminal device is in the conference end state, the conference operation indicator light is always off, and the voltage at the positive pin of the conference operation indicator light is low.

[0066] At this time, the base of transistor Q1 is at a low level, the emitter is cut off, and the collector is at a high level;

[0067] At this time, the C+ pin of the latch U1 is at a high level, and the 8Q pin of the latch is in a pass-through state, that is, the output level of the 8Q pin of the latch changes synchronously with the input level of the 8D pin;

[0068] At this time, the conference mode switching operation is enabled.

[0069] (2) Video conferencing terminal power supply control function:

[0070] When the video conferencing terminal device is in the conference end state, the conference mode switching operation is enabled, and the output level of the latch 8Q pin changes synchronously with the input level of the 8D pin:

[0071] ① When the video conferencing terminal mode switching device MODE_SW is at a high level (high level represents confidential video conferencing mode, low level represents non-confidential video conferencing mode), the input level of the latch 8D pin is high, the output pin of the latch 8Q pin is high, the first and second pins of the optocoupler OC are turned on, the optocoupler pins 3 and 4 are turned on, the base of the transistor Q2 is at a high level, the emitter of the transistor Q2 is turned on, the current is conducted between the third pin of the relay K, the magnetic core of the relay K produces an adsorption action, the power supply device POW_DEVICE is disconnected from the power input interface PUB_MEETING_POW of the non-volatile memory of the non-confidential video conferencing component, and is connected to the power input interface SEC_MEETING_POW of the non-volatile memory of the confidential video conferencing component.

[0072] At this time, the conference terminal device can turn on the confidential video conference mode and can hold confidential video conferences, but cannot hold non-confidential video conferences.

[0073] ② When the video conferencing terminal mode switching device MODE_SW is at a low level (high level represents confidential video conferencing mode, low level represents non-confidential video conferencing mode), the input level of the latch 8D pin is low level, the output pin of the latch 8Q pin is low level, the first and second pins of the optocoupler OC stop conducting, the third and fourth pins of the optocoupler OC stop conducting, the base of the transistor Q2 is at a low level, the emitter of the transistor Q2 is cut off, the current between the third and fourth pins of the relay K is interrupted, the magnetic core of the relay K stops the adsorption action, the power supply device POW_DEVICE is disconnected from the power input interface PUB_MEETING_POW of the non-volatile memory of the confidential video conferencing component, and is connected to the power input interface SEC_MEETING_POW of the non-volatile memory of the non-confidential video conferencing component.

[0074] At this time, the conference terminal device can open the non-confidential video conference mode and can hold non-confidential video conferences, but cannot hold confidential video conferences.

[0075] Specifically, when the video conferencing terminal device is in a conference running state, the conference mode switching operation is prohibited; when the video conferencing terminal device is in a conference ending state, the conference mode switching operation is enabled.

[0076] When the video conferencing terminal device switches from non-confidential video conferencing mode to confidential video conferencing mode, the power connection between the power supply device and the non-volatile memory of the non-confidential video conferencing component is disconnected, and the power connection between the power supply device and the non-volatile memory of the confidential video conferencing component is reconnected. At this point, the conferencing terminal device can enter confidential video conferencing mode and hold confidential video conferences, but cannot hold non-confidential video conferences.

[0077] When the video conferencing terminal mode switching device switches from secure video conferencing mode to non-secure video conferencing mode while the video conferencing terminal is in the conference-ending state, the power connection between the power supply device and the non-volatile memory of the secure video conferencing component is disconnected, and the power connection between the power supply device and the non-volatile memory of the non-secure video conferencing component is reconnected. At this point, the conferencing terminal device can enter non-secure video conferencing mode and hold non-secure video conferences, but cannot hold secure video conferences.

[0078] In summary, with the aid of the above-mentioned technical solution of the present invention, the present invention provides power to the non-volatile memory of the corresponding component (non-confidential video conferencing component or confidential video conferencing component) according to the current non-confidential video conferencing mode or confidential video conferencing mode, and at the same time cuts off the power supply to the non-volatile memory of the other component, thereby ensuring that within a time period, the video conferencing terminal device can only run one conference mode, and any persistent information of the two types of video conferencing remains physically isolated, thereby ensuring that any sensitive information will not be accessed by unauthorized modes, thereby enhancing the security of the information. The present invention is capable of detecting the current working status of the video conferencing terminal device. If the video conferencing terminal device is in a conference running state, the conference mode switching operation must be prohibited. If the video conferencing terminal device is in a conference ending state, the conference mode switching operation is enabled, thereby not only improving the flexibility of use of the power supply control device, allowing the user to easily switch conference modes as needed, but also maintaining the safety and practicality of the device.

[0079] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A power supply control device for a dual-mode video conferencing terminal device, characterized in that: The power supply control device includes a latch U1, a conference operation indicator light D1, a light-emitting diode D2, a transistor Q1, a transistor Q2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a photocoupler OC, a diode D3 and a relay K; The first pin of the latch U1 is connected to the tenth pin and grounded, the eleventh pin of the latch U1 is respectively connected to one end of the resistor R2 and the collector of the transistor Q1, and the other end of the resistor R2 is connected to a 5V digital power supply; the base of the transistor Q1 is respectively connected to the positive electrode and INNER_CIRUIT of the conference operation indicator D1 through the resistor R1, the negative electrode of the conference operation indicator D1 is grounded, and the emitter of the transistor Q1 is grounded; the eighteenth pin of the latch U1 is connected to the video conference terminal mode switching device, the nineteenth pin of the latch U1 is connected to the positive electrode of the light emitting diode D2, the negative electrode of the light emitting diode D2 is connected to the first pin of the photoelectric coupler OC through the resistor R3, and the photoelectric coupler OC is connected to the positive electrode of the light emitting diode D2. The second pin of the coupler OC is grounded, the third pin of the photocoupler OC is connected to the base of the transistor Q2 via the resistor R4, the collector of the transistor Q2 is respectively connected to the fourth pin of the relay K and the positive electrode of the diode D3, the cathode of the diode D3 is respectively connected to the third pin of the relay K and the fourth pin of the photocoupler OC and connected to a 5V analog power supply; the first pin of the relay K is connected to the power input interface of the confidential conference mode non-volatile memory, the second pin of the relay K is connected to the power input interface of the non-confidential conference mode non-volatile memory, the fifth pin of the relay K is connected to the power supply device, the emitter of the transistor Q2 is grounded, and the twentieth pin of the latch U1 is connected to a 5V digital power supply.

2. A power supply control device for a dual-mode video conferencing terminal device according to claim 1, characterized in that: The transistor Q1 and the transistor Q2 are both NPN transistors.

3. A power supply control device for a dual-mode video conferencing terminal device according to claim 2, characterized in that: When the eleventh pin of the latch U1 is at a low level, the level output of the nineteenth pin changes synchronously with the level of the eighteenth pin, and the output level of the nineteenth pin always remains consistent with the input level of the eighteenth pin.

4. A power supply control device for a dual-mode video conferencing terminal device according to claim 3, characterized in that: The relay K is a single-pole double-throw relay, and the relay K is used to implement power switching between the power supply device and the non-volatile memory.

5. The power supply control device for a dual-mode video conferencing terminal device according to claim 4, characterized in that: When current is conducted between the third pin and the fourth pin of the relay K, the magnetic core of the relay K produces an adsorption action, causing the fifth pin of the relay K to be disconnected from the second pin, and the fifth pin of the relay K to be closed to the first pin, and the power supply device to be disconnected from the power input interface of the non-volatile memory of the non-confidential video conferencing component, and at the same time connected to the power input interface of the non-volatile memory of the confidential video conferencing component.

6. A power supply control device for a dual-mode video conferencing terminal device according to claim 5, characterized in that: The operating voltage of the non-volatile memory is 5V, and the power input interface of the non-volatile memory is a SATA power interface.

7. A power supply control device for a dual-mode video conferencing terminal device according to claim 6, characterized in that: The power supply device is used to provide a 5V voltage, and the maximum supply current of the power supply device is less than or equal to 5A.

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