Hybrid communication system based on anti-quantum computing and equipment thereof

Abstract

The invention discloses a hybrid communication system based on anti-quantum computing, which is applied to communication equipment, and the communication system comprises the following steps: step 1, an auxiliary server of a mobile communication system issues an encrypted digital certificate to each mobile terminal; step 2, the auxiliary server of the mobile communication system performs identity authentication on the mobile terminal A and the mobile terminal B; and 3, after a confirmation signal of the auxiliary server of the mobile communication system is obtained, the main server of the mobile communication system carries out identity authentication on the mobile terminal A and the mobile terminal B, and after the identity authentication is passed, the main server of the mobile communication system distributes a second secret key for the mobile terminals. Identity confirmation is carried out before mutual communication encryption of the mobile terminals so as to ensure that the mobile terminal A and the mobile terminal B are not invaded and are safe; the auxiliary server of the mobile communication system can issue an encrypted digital certificate and also can perform identity verification, so that the utilization rate of the auxiliary server of the mobile communication system is improved, and the operation efficiency of the system is improved.

Description

Technical Field

[0001] The present invention relates to the field of communication security technologies, and particularly relates to a quantum-computing-resistant hybrid communication system and its device. Background Art

[0002] With the progress of society, mobile communication has been fully popularized among the people. To ensure the security of national communication, communication encryption and transmission security both rely on complex mathematical algorithms. With the rise of quantum computers, communication systems are all faced with potential security and confidentiality risks.

[0003] In the prior art, according to the patent number CN114785488A, patent name: A Mobile Communication Method and Communication System Resistant to Quantum Computing, which records the following content: "It includes the following steps: S1. The certificate issuing server issues encrypted digital certificates to mobile terminals respectively; S2. Mobile terminal 1 and mobile terminal 2 respectively perform identity authentication with the mobile communication system server. After the authentication is passed, the mobile communication system server assigns a first key to the mobile terminal, and the first key is used for communication between mobile terminals; S3. After the mobile terminal completes two-way identity authentication, it obtains a second key negotiated through digital certificates; S4. The mobile terminal calculates a quantum-computing-resistant session key by using the first key and the second key through an irreversible function; S5. The mobile terminal uses the quantum-computing-resistant session key for secure communication." Those skilled in the art can know that after the patent authenticates the identity of the mobile terminal, it then conducts a secure call to ensure communication security. However, if the mobile terminal has been compromised before the identity confirmation, the so-called identity confirmation cannot guarantee reliability; moreover, the function of the certificate issuing server is only to issue encrypted digital certificates and does not form data transmission with the mobile communication system server, which is likely to cause information deviation. Summary of the Invention

[0004] In order to overcome the above deficiencies, the present invention provides a quantum-computing-resistant hybrid communication system and its device.

[0005] The present invention realizes the above object through the following technical solutions:

[0006] A quantum-computing-resistant hybrid communication system is applied to communication devices, and the communication system includes the following steps:

[0007] Step 1: The sub-server of the mobile communication system issues encrypted digital certificates to each mobile terminal;

[0008] Step 2: The sub-server of the mobile communication system authenticates the identities of mobile terminal A and mobile terminal B. After the identity authentication is passed, the sub-server of the mobile communication system assigns a first key to the mobile terminal;

[0009] Step 3: After obtaining the confirmation signal from the secondary server of the mobile communication system, the primary server of the mobile communication system authenticates the mobile terminal A and the mobile terminal B. After the authentication passes, the primary server of the mobile communication system assigns a second key to the mobile terminal.

[0010] Step 4: The mobile terminal calculates an anti-quantum computing session key by using the first key and the second key through an irreversible function.

[0011] Step 5: The mobile terminal performs secure communication by using the anti-quantum computing session key.

[0012] In Step 2, the secondary server of the mobile communication system sends a historical first key query instruction to the mobile terminal A and the mobile terminal B. After receiving the historical first key query instruction, the mobile terminal A and the mobile terminal B send the specified historical first key to the secondary server of the mobile communication system. The secondary server of the mobile communication system authenticates the mobile terminal A and the mobile terminal B according to the query trace of the historical first key.

[0013] Preferably, in Step 1, the secondary server of the mobile communication system generates a first random number, encrypts the digital certificate of the mobile terminal and encrypts the private key for invoking the first key. The private key is added with a self-destruction program and will automatically disappear after receiving a query instruction other than from the secondary server of the mobile communication system. In this way, when the mobile terminal is invaded, the internal communication program of the system will be controlled, and at this time, the private key will be queried and the private key will automatically disappear.

[0014] Preferably, in Step 2, when the secondary server of the mobile communication system sends a historical first key query instruction to the mobile terminal A and the mobile terminal B, it will also give the CPU and the encrypted digital certificate of the mobile terminal at the same time. When the mobile terminal is not invaded, when the CPU and the encrypted digital certificate of the mobile terminal receive the instruction at the same time, the encrypted digital certificate will send the historical first key to the secondary server of the mobile communication system prior to the CPU of the mobile terminal for the secondary server of the mobile communication system to perform authentication; when the mobile terminal is invaded, the private key has been queried and thus destroyed, and the encrypted digital certificate loses its effect, then the CPU of the mobile terminal sends the historical first key to the secondary server of the mobile communication system, and the secondary server of the mobile communication system will authenticate according to the source of the received data.

[0015] An anti-quantum computing hybrid communication device for implementing the anti-quantum computing hybrid communication system of the above claims. The communication device includes a primary server of the mobile communication system, a secondary server of the mobile communication system, and a plurality of mobile terminals. The primary server of the mobile communication system is wirelessly connected to the secondary server of the mobile communication system, and the mobile terminals are respectively wirelessly connected to the primary server of the mobile communication system and the secondary server of the mobile communication system.

[0016] Preferably, both the main server and the secondary server of the mobile communication system include a power supply module. The power supply module includes a power supply circuit, which includes a rectifier, a first resistor, a second resistor, a third resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a first capacitor, a second capacitor, a third capacitor, a fifth capacitor, a sixth capacitor, an eighth capacitor, a first diode, a second diode, a third diode, a fourth diode, a field effect transistor, a transformer, and a triode. The input side of the rectifier bridge is externally connected to the mains power supply, the negative electrode of the output side of the rectifier bridge is grounded, and the positive electrode of the output side of the rectifier bridge is grounded through the first resistor and the first capacitor. The transformer includes a primary coil, a secondary coil, and a feedback coil. The positive electrode of the output side of the rectifier bridge is electrically connected to the source electrode of the field effect transistor through the first resistor and the primary coil. The series circuit composed of the second capacitor and the first diode is connected in parallel with the primary coil, and the second capacitor is connected in parallel with the third resistor. The model of the integrated circuit is UC3842. The second terminal of the integrated circuit is electrically connected to the collector of the triode through the fourteenth resistor, the first terminal of the integrated circuit is electrically connected to the collector of the triode through the fifteenth resistor, the emitter of the triode is grounded through the seventeenth resistor, the base of the triode is electrically connected to the fourth terminal of the integrated circuit, the base of the triode is electrically connected to the fourth terminal of the integrated circuit through the sixteenth resistor, the fourth terminal of the integrated circuit is electrically connected to the collector of the triode, the base of the triode is grounded through the eighth capacitor, the fifth terminal of the integrated circuit is grounded, the seventh terminal of the integrated circuit is electrically connected to the primary coil of the transformer through the second resistor, the seventh terminal of the integrated circuit is electrically connected to the cathode of the fourth diode, the anode of the fourth diode is grounded through the feedback coil, the anode of the first diode is grounded through the fifth capacitor and the eighth resistor, the eighth resistor is connected in parallel with the second diode, the cathode of the second diode is grounded, the anode of the first diode is electrically connected to the source electrode of the field effect transistor, the drain of the field effect transistor is grounded through the ninth resistor, the gate of the field effect transistor is electrically connected to the sixth terminal of the integrated circuit through the eleventh resistor, the gate of the field effect transistor is grounded through the tenth resistor, the drain of the field effect transistor is grounded through the ninth resistor, the drain of the field effect transistor is electrically connected to the fifth terminal of the integrated circuit through the twelfth resistor, the fifth terminal of the integrated circuit is grounded, the fifth terminal of the integrated circuit is grounded through the sixth capacitor, one end of the secondary coil of the transformer is grounded, the other end of the secondary coil of the transformer is electrically connected to the anode of the third diode, and the cathode of the third diode is grounded through the third capacitor. In this power supply circuit, the feedback coil of the transformer transmits the feedback voltage signal to the integrated circuit, and the integrated circuit performs PWM regulation according to the feedback voltage to achieve the stability of the output voltage and improve the stability of the operation of the communication device.

[0017] Preferably, the power supply circuit further includes a feedback circuit, which includes an optocoupler, a fourth capacitor, a seventh capacitor, a thirteenth resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor. The second terminal of the integrated circuit is electrically connected to the third terminal of the optocoupler through the thirteenth resistor. The fourth terminal of the optocoupler is electrically connected to the first terminal of the integrated circuit. The seventh capacitor is connected in parallel between the third terminal and the fourth terminal of the optocoupler. The third terminal of the optocoupler is grounded. The first terminal of the optocoupler is electrically connected to the cathode of the third diode through the fourth resistor. The second terminal of the optocoupler is grounded. The second terminal of the optocoupler is grounded through the fourth capacitor and the seventh resistor. The second terminal of the optocoupler is electrically connected to the fifth resistor and the sixth resistor through the eighth resistor. The cathode of the third diode is grounded through the fifth resistor and the sixth resistor. The feedback circuit is added to the power supply circuit, which can feedback the output voltage of the secondary coil of the transformer. At the same time, through optocoupler isolation, it can protect the internal circuit. The integrated circuit receives the feedback signal of the feedback circuit and combines it with the feedback signal of the feedback coil, and the two combinations can further improve the stability of the output voltage.

[0018] The beneficial effects of the present invention are as follows: In the quantum-resistant computing hybrid communication system and its equipment:

[0019] 1. Identity confirmation is carried out before encrypting the mutual communication of mobile terminals to ensure that both mobile terminal A and mobile terminal B are not invaded and are safe, ensuring the reliability of subsequent quantum-resistant encryption;

[0020] 2. The secondary server of the mobile communication system can not only issue encrypted digital certificates but also conduct identity verification, improving the utilization rate of the secondary server of the mobile communication system and the operation efficiency of the system;

[0021] 3. In the power supply circuit, the integrated circuit can not only collect the voltage feedback signal through the feedback coil of the transformer but also feedback the output voltage through the feedback circuit, thereby controlling the stability of the output voltage and improving the operation stability of the communication device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be described by way of examples with reference to the accompanying drawings, where:

[0023] Figure 1 is the system operation diagram of the present invention;

[0024] Figure 2 is the circuit schematic diagram of the power supply circuit of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic way, so they only show the components related to the present invention.

[0026] AsFigure 1 As shown in the figure, a quantum-resistant hybrid communication system is applied to a communication device, and the communication system includes the following steps:

[0027] Step 1: The secondary server of the mobile communication system issues encrypted digital certificates to each mobile terminal;

[0028] Step 2: The secondary server of the mobile communication system authenticates mobile terminal A and mobile terminal B. After the authentication is passed, the secondary server of the mobile communication system assigns a first key to the mobile terminal;

[0029] Step 3: After obtaining the confirmation signal from the secondary server of the mobile communication system, the primary server of the mobile communication system authenticates mobile terminal A and mobile terminal B. After the authentication is passed, the primary server of the mobile communication system assigns a second key to the mobile terminal;

[0030] Step 4: The mobile terminal calculates a quantum-resistant session key by using the first key and the second key through an irreversible function;

[0031] Step 5: The mobile terminal uses the quantum-resistant session key to conduct secure communication;

[0032] In Step 2, the secondary server of the mobile communication system sends a historical first key query instruction to mobile terminal A and mobile terminal B. After mobile terminal A and mobile terminal B receive the historical first key query instruction, they send the specified historical first key to the secondary server of the mobile communication system. The secondary server of the mobile communication system authenticates mobile terminal A and mobile terminal B based on the query trace of the historical first key. This step can confirm the identity before encrypting the communication between mobile terminals to ensure that neither mobile terminal A nor mobile terminal B has been invaded and is secure.

[0033] Specifically, in Step 1, the secondary server of the mobile communication system generates a first random number, encrypts the digital certificate of the mobile terminal with the first random number, and encrypts the private key for calling the first key. The private key is added with a self-destruction program and will automatically disappear after receiving a query instruction other than from the secondary server of the mobile communication system. In this way, when the mobile terminal is invaded, the internal communication program of the system will be controlled, and at this time, the private key will be queried and the private key will automatically disappear.

[0034] Specifically, in step 2, the historical first key query instruction sent by the secondary server of the mobile communication system to mobile terminal A and mobile terminal B will also provide the CPU and encryption digital certificate of the mobile terminal. When the mobile terminal has not been invaded, when the CPU and encryption digital certificate of the mobile terminal receive the instruction simultaneously, the encryption digital certificate will send the historical first key to the secondary server of the mobile communication system prior to the CPU of the mobile terminal for identity authentication by the secondary server of the mobile communication system; when the mobile terminal has been invaded and the private key has been queried and thus destroyed, the encryption digital certificate becomes ineffective, and then the CPU of the mobile terminal will send the historical first key to the secondary server of the mobile communication system, and the secondary server of the mobile communication system will perform identity authentication based on the source of the received data.

[0035] A quantum computing-resistant hybrid communication device for implementing the quantum computing-resistant hybrid communication system of the above claims. The communication device includes a primary server of the mobile communication system, a secondary server of the mobile communication system, and a plurality of mobile terminals. The primary server of the mobile communication system is wirelessly connected to the secondary server of the mobile communication system, and the mobile terminals are respectively wirelessly connected to the primary server of the mobile communication system and the secondary server of the mobile communication system.

[0036] Such as Figure 2As shown, specifically, both the main server and the secondary server of the mobile communication system include a power module. The power module includes a power circuit, and the power circuit includes a rectifier N1, a first resistor R1, a second resistor R2, a third resistor R3, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fifth capacitor C5, a sixth capacitor C6, an eighth capacitor C8, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a field effect transistor S1, a transformer T1, and a triode Q1. The input side of the rectifier bridge is externally connected to the commercial power supply, the negative electrode of the output side of the rectifier bridge is grounded, the positive electrode of the output side of the rectifier bridge is grounded through the first resistor R1 and the first capacitor C1. The transformer T1 includes a primary coil, a secondary coil, and a feedback coil. The positive electrode of the output side of the rectifier bridge is electrically connected to the source electrode of the field effect transistor S1 through the first resistor R1 and the primary coil. The series circuit composed of the second capacitor C2 and the first diode D1 is connected in parallel with the primary coil. The second capacitor C2 is connected in parallel with the third resistor R3. The model of the integrated circuit is UC3842. The second terminal of the integrated circuit is electrically connected to the collector of the triode Q1 through the fourteenth resistor R14. The first terminal of the integrated circuit is electrically connected to the collector of the triode Q1 through the fifteenth resistor R15. The emitter of the triode Q1 is grounded through the seventeenth resistor R17. The base of the triode Q1 is electrically connected to the fourth terminal of the integrated circuit. The base of the triode Q1 is electrically connected to the fourth terminal of the integrated circuit through the sixteenth resistor R16. The fourth terminal of the integrated circuit is electrically connected to the collector of the triode Q1. The base of the triode Q1 is grounded through the eighth capacitor C8. The fifth terminal of the integrated circuit is grounded. The seventh terminal of the integrated circuit is electrically connected to the primary coil of the transformer T1 through the second resistor R2. The seventh terminal of the integrated circuit is electrically connected to the cathode of the fourth diode D4. The anode of the fourth diode D4 is grounded through the feedback coil. The anode of the first diode D1 is grounded through the fifth capacitor C5 and the eighth resistor R8. The eighth resistor R8 is connected in parallel with the second diode D2. The cathode of the second diode D2 is grounded. The anode of the first diode D1 is electrically connected to the source electrode of the field effect transistor S1. The drain of the field effect transistor S1 is grounded through the ninth resistor R9. The gate of the field effect transistor S1 is electrically connected to the sixth terminal of the integrated circuit through the eleventh resistor R11. The gate of the field effect transistor S1 is grounded through the tenth resistor R10. The drain of the field effect transistor S1 is grounded through the ninth resistor R9. The drain of the field effect transistor S1 is electrically connected to the fifth terminal of the integrated circuit through the twelfth resistor R12. The fifth terminal of the integrated circuit is grounded. The fifth terminal of the integrated circuit is grounded through the sixth capacitor C6. One end of the secondary coil of the transformer T1 is grounded. The other end of the secondary coil of the transformer T1 is electrically connected to the anode of the third diode D3. The cathode of the third diode D3 is grounded through the third capacitor C3. In this power circuit,The feedback coil of transformer T1 transmits the feedback voltage signal to the integrated circuit, and the integrated circuit performs PWM regulation according to the feedback voltage to achieve the stability of the output voltage and improve the stability of the operation of the communication device.

[0037] Specifically, the power supply circuit further includes a feedback circuit. The feedback circuit includes an optocoupler OP1, a fourth capacitor C4, a seventh capacitor C7, a thirteenth resistor R13, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. The second terminal of the integrated circuit is electrically connected to the third terminal of the optocoupler OP1 through the thirteenth resistor R13. The fourth terminal of the optocoupler OP1 is electrically connected to the first terminal of the integrated circuit. The seventh capacitor C7 is connected in parallel between the third terminal and the fourth terminal of the optocoupler OP1. The third terminal of the optocoupler OP1 is grounded. The first terminal of the optocoupler OP1 is electrically connected to the cathode of the third diode D3 through the fourth resistor R4. The second terminal of the optocoupler OP1 is grounded. The second terminal of the optocoupler OP1 is grounded through the fourth capacitor C4 and the seventh resistor R7. The second terminal of the optocoupler OP1 is electrically connected to the fifth resistor R5 and the sixth resistor R6 through the eighth resistor R8. The cathode of the third diode D3 is grounded through the fifth resistor R5 and the sixth resistor R6. The addition of the feedback circuit in the power supply circuit can feedback the output voltage of the secondary coil of the transformer T1. At the same time, through the isolation of the optocoupler OP1, it can play a protective role for the internal circuit. The integrated circuit receives the feedback signal of the feedback circuit and combines it with the feedback signal of the feedback coil. The combination of the two can further improve the stability of the output voltage.

[0038] Based on the inspiration of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A quantum-resistant hybrid communication system, characterized in that: Applied to a communication device, the communication system includes the following steps: Step 1: The secondary server of the mobile communication system issues encrypted digital certificates to each mobile terminal; Step 2: The secondary server of the mobile communication system authenticates mobile terminal A and mobile terminal B. After the authentication passes, the secondary server of the mobile communication system assigns a first key to the mobile terminal; Step 3: After obtaining the confirmation signal from the secondary server of the mobile communication system, the primary server of the mobile communication system authenticates mobile terminal A and mobile terminal B. After the authentication passes, the primary server of the mobile communication system assigns a second key to the mobile terminal; Step 4: The mobile terminal uses the first key and the second key to calculate an anti-quantum computing session key using an irreversible function; Step 5: The mobile terminal uses the anti-quantum computing session key to conduct secure communication; In Step 2, the secondary server of the mobile communication system sends a historical first key query instruction to mobile terminal A and mobile terminal B. After mobile terminal A and mobile terminal B receive the historical first key query instruction, they send the specified historical first key to the secondary server of the mobile communication system. The secondary server of the mobile communication system authenticates mobile terminal A and mobile terminal B based on the query trace of the historical first key.

2. The hybrid communication system based on anti-quantum computing according to claim 1, wherein: In Step 1, the secondary server of the mobile communication system generates a first random number, encrypts the digital certificate of the mobile terminal with the first random number, and encrypts the private key for invoking the first key. The private key is added with a self-destruction program and will automatically disappear after receiving a query instruction other than from the secondary server of the mobile communication system.

3. The hybrid communication system based on anti-quantum computing according to claim 1, characterized in that: In Step 2, when the secondary server of the mobile communication system sends the historical first key query instruction to mobile terminal A and mobile terminal B, it also provides the CPU and the encrypted digital certificate of the mobile terminal.

4. A quantum-resistant hybrid communication device for implementing the quantum-resistant hybrid communication system according to any one of claims 1-3, characterized in that: The communication device includes a primary server of the mobile communication system, a secondary server of the mobile communication system, and several mobile terminals. The primary server of the mobile communication system is wirelessly connected to the secondary server of the mobile communication system, and the mobile terminals are wirelessly connected to the primary server of the mobile communication system and the secondary server of the mobile communication system respectively.

5. The hybrid communication device based on anti-quantum computing according to claim 4, wherein: Both the main server and the secondary server of the mobile communication system include a power module. The power module includes a power circuit, and the power circuit includes a rectifier, a first resistor, a second resistor, a third resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a first capacitor, a second capacitor, a third capacitor, a fifth capacitor, a sixth capacitor, an eighth capacitor, a first diode, a second diode, a third diode, a fourth diode, a field effect transistor, a transformer, and a triode. The input side of the rectifier bridge is externally connected to the mains power supply, the negative electrode of the output side of the rectifier bridge is grounded, the positive electrode of the output side of the rectifier bridge is grounded through the first resistor and the first capacitor. The transformer includes a primary coil, a secondary coil, and a feedback coil. The positive electrode of the output side of the rectifier bridge is electrically connected to the source electrode of the field effect transistor through the first resistor and the primary coil. The series circuit composed of the second capacitor and the first diode is connected in parallel with the primary coil. The second capacitor is connected in parallel with the third resistor. The model of the integrated circuit is UC3842. The second terminal of the integrated circuit is electrically connected to the collector of the triode through the fourteenth resistor. The first terminal of the integrated circuit is electrically connected to the collector of the triode through the fifteenth resistor. The emitter of the triode is grounded through the seventeenth resistor. The base of the triode is electrically connected to the fourth terminal of the integrated circuit. The base of the triode is electrically connected to the fourth terminal of the integrated circuit through the sixteenth resistor. The fourth terminal of the integrated circuit is electrically connected to the collector of the triode. The base of the triode is grounded through the eighth capacitor. The fifth terminal of the integrated circuit is grounded. The seventh terminal of the integrated circuit is electrically connected to the primary coil of the transformer through the second resistor. The seventh terminal of the integrated circuit is electrically connected to the cathode of the fourth diode. The anode of the fourth diode is grounded through the feedback coil. The anode of the first diode is grounded through the fifth capacitor and the eighth resistor. The eighth resistor is connected in parallel with the second diode. The cathode of the second diode is grounded. The anode of the first diode is electrically connected to the source electrode of the field effect transistor. The drain of the field effect transistor is grounded through the ninth resistor. The gate of the field effect transistor is electrically connected to the sixth terminal of the integrated circuit through the eleventh resistor. The gate of the field effect transistor is grounded through the tenth resistor. The drain of the field effect transistor is grounded through the ninth resistor. The drain of the field effect transistor is electrically connected to the fifth terminal of the integrated circuit through the twelfth resistor. The fifth terminal of the integrated circuit is grounded. The fifth terminal of the integrated circuit is grounded through the sixth capacitor. One end of the secondary coil of the transformer is grounded, and the other end of the secondary coil of the transformer is electrically connected to the anode of the third diode. The cathode of the third diode is grounded through the third capacitor.

6. The hybrid communication device based on anti-quantum computing according to claim 5, wherein: The power supply circuit further includes a feedback circuit, which includes an optocoupler, a fourth capacitor, a seventh capacitor, a thirteenth resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor. The second terminal of the integrated circuit is electrically connected to the third terminal of the optocoupler through the thirteenth resistor. The fourth terminal of the optocoupler is electrically connected to the first terminal of the integrated circuit. The seventh capacitor is connected in parallel between the third terminal and the fourth terminal of the optocoupler. The third terminal of the optocoupler is grounded. The first terminal of the optocoupler is electrically connected to the cathode of the third diode through the fourth resistor. The second terminal of the optocoupler is grounded. The second terminal of the optocoupler is grounded through the fourth capacitor and the seventh resistor. The second terminal of the optocoupler is electrically connected to the fifth resistor and the sixth resistor respectively through the eighth resistor. The cathode of the third diode is grounded through the fifth resistor and the sixth resistor.

Images