A surge protection circuit for network transmission and access equipment

Abstract

The present invention discloses a surge protection circuit for network transmission and access equipment, including a charging input circuit J4, a diode T6, a diode D3, an overvoltage protection chip U6, a chip U3, a DC-DC boost chip U5 and a voltage stabilizing circuit U4, wherein the port VBUS2 of the charging input circuit J4 is connected to the cathode of the diode T6, the cathode of the diode D3, the capacitor C55 and the pin 3 of the chip U6 through a fuse F1, and the pin 4 of the chip U6 is connected to the resistor R39 and the pin 4 of the chip U3. The surge protection circuit design of the device of the present invention is simple and reasonable, safe and reliable, low in cost, suitable for large-scale production, and the surge protection level reaches ±320V / 5 seconds.

Description

Technical Field

[0001] The invention relates to the technical field of personal care and beauty instruments, in particular to a surge protection circuit for network transmission and access equipment. Background Art

[0002] The circuit of the known existing visual blackhead remover device has poor surge protection performance. When the charging line is plugged in or out, the surge voltage is too high, which damages the subsequent circuit. In the existing power supply circuit module, the surge protection circuit only uses an overvoltage protection diode T3, and no overvoltage protection chip is used. The charging management circuit U3 also has no overvoltage protection function. It cannot withstand a surge voltage above 24V, and the subsequent circuit components will be damaged. Summary of the invention

[0003] The object of the present invention is to provide a surge protection circuit for network transmission and access equipment to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A surge protection circuit for network transmission and access equipment comprises a charging input circuit J4, a diode T6, a diode D3, an overvoltage protection chip U6, a chip U3, a DC-DC boost chip U5 and a voltage stabilizing circuit U4, wherein the port VBUS2 of the charging input circuit J4 is connected to the cathode of the diode T6, the cathode of the diode D3, a capacitor C55 and the pin 3 of the chip U6 through a fuse F1, the pin 4 of the chip U6 is connected to the resistor R39 and the pin 4 of the chip U3, the other end of the resistor R39 is connected to the resistor R40 and the capacitor C8, the other end of the capacitor C8 is connected to the other end of the resistor R40, the pin 5 of the chip U3 is connected to the capacitor C11, the capacitor C69, the pin 5 of the DC-DC boost chip U5, the pin 1 of the voltage stabilizing circuit U4 and the positive electrode of the battery BT1, and the negative electrode of the battery BT1 is connected to the other end of the capacitor C69, the other end of the capacitor C11 and the ground.

[0006] As a further technical solution of the present invention: the battery BT1 is also connected to the main control circuit module, the main control circuit module includes a main control chip U1, a program storage chip U2, a crystal oscillator Y1, status indicator lights D2, D3, D4, LED_G, LED_R, a radio frequency antenna E1, and filter capacitors C2, C5, and C3. The main control chip U1 is respectively connected to the program storage chip U2, the crystal oscillator Y1, the status indicator lights D2, D3, D4, LED_G, LED_R, the radio frequency antenna E1, and the filter capacitors C2, C5, and C3.

[0007] As a further technical solution of the present invention: the DC-DC boost chip U5 outputs +5V DC power, and the voltage stabilizing circuit U4 outputs +3.0V DC power.

[0008] As a further technical solution of the present invention: the DC-DC boost chip U5 is also connected to a camera module circuit, which includes a camera sensor J2, a lighting lamp LED, a transistor Q1, a MOS tube Q2, a data bus SEN0_D2 to SEN0_D9, and a control bus SEN0_VSYN, SEN0_PCLK, SEN0_PWDN, SEN0_MCLK, SEN0_SDA, and SEN0_SCL. The camera sensor J2 is connected to the drain of the MOS tube Q2 through a resistor R13, the gate of the MOS tube Q2 is connected to a resistor R21 and a collector of the transistor Q1, the base of the transistor Q1 is connected to a resistor R22 and a resistor R34, and the other end of the resistor R34 is connected to the lighting lamp LED.

[0009] As a further technical solution of the present invention: the voltage stabilizing circuit U4 is also connected to an air pump circuit module, which includes a MOS tube Q3, a diode D5, a capacitor C19, resistors R2, R3 and a motor J1, the gate of the MOS tube Q3 is connected to resistors R2 and R3, the other end of the resistor R2 is connected to the main control chip U1, the other point of the resistor R3 is grounded, the source of the MOS tube Q3 is grounded, the drain of the MOS tube Q3 is connected to the anode of the diode D5, the capacitor C19 and the motor J1, and the cathode of the diode D5 is connected to the other end of the capacitor C19 and the other end of the motor J1.

[0010] As a further technical solution of the present invention: the MOS tube Q3 is an N-MOS tube.

[0011] As a further technical solution of the present invention: the transistor Q1 is an NPN transistor.

[0012] Compared with the prior art, the beneficial effects of the present invention are: the surge protection circuit design of the device of the present invention is simple and reasonable, safe and reliable, low cost, suitable for large-scale production, and the surge protection level reaches ±320V / 5 seconds. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a circuit diagram of the present invention.

[0014] Figure 2 This is the circuit diagram of the main control circuit module.

[0015] Figure 3 is the circuit diagram of the camera module circuit.

[0016] Figure 4 It is the circuit diagram of the air pump circuit module. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example 1: Please refer to Figure 1A network transmission and access equipment surge protection circuit includes a charging input circuit J4, a diode T6, a diode D3, an overvoltage protection chip U6, a chip U3, a DC-DC boost chip U5 and a voltage stabilizing circuit U4. The port VBUS2 of the charging input circuit J4 is connected to the cathode of the diode T6, the cathode of the diode D3, the capacitor C55 and the pin 3 of the chip U6 through the fuse F1. The pin 4 of the chip U6 is connected to the resistor R39 and the pin 4 of the chip U3. The other end of the resistor R39 is connected to the resistor R40 and the capacitor C8. The other end of the capacitor C8 is connected to the other end of the resistor R40. The pin 5 of the chip U3 is connected to the capacitor C11, the capacitor C69, the pin 5 of the DC-DC boost chip U5, the pin 1 of the voltage stabilizing circuit U4 and the positive electrode of the battery BT1. The negative electrode of the battery BT1 is connected to the other end of the capacitor C69, the other end of the capacitor C11 and the ground. The charging input circuit J4 is connected to the positive electrode of the battery BT1 through the USB TYPE C line, a 5V power supply VBUS1 and VBUS2 are introduced from this port, and USB_IN is output through the overvoltage protection chip U6 / ET9528, which inputs U3 / ETA4056, and after conversion by the charging management circuit U3, a charging power supply VBAT is output to the 3.7V lithium battery BT1. When the charging line is plugged in and out, a surge voltage signal exceeding +5V appears between the positive pole and the ground line of the USB line. If the surge voltage is 6.1V~36V, the overvoltage protection chip U6 / ET9528 shuts down the charging output. If there is a transient surge voltage connected to the USB_IN line, the chip U3 / ETA4056 with overvoltage protection can withstand voltage shocks below 24V. If the surge voltage is above 24V, the overvoltage protection diode T6 / PTVSHC3N24VUH will avalanche conduct, and can absorb a maximum of 5500W surge energy. If the surge voltage is above 40V, the 40V overvoltage protection diode D3 / PSBD1DF40V1H will avalanche conduct and absorb 40W surge energy. The 0.8-meter-long USB charging cable and the self-recovery fuse F1 / 24V / 0.5A can buffer the surge voltage to a certain extent. In summary, after the measured +320V / 5-second surge impact, no components of this circuit are damaged, thus protecting the safety of the battery and subsequent related circuits. In another case, when the charging cable is plugged in and out, a negative surge voltage signal appears between the positive electrode of the USB cable and the ground wire. If the surge voltage is below -0.75V, the overvoltage protection diode T6 / PTVSHC3N24VUH is forward-conducted and can absorb a maximum of 5500W surge energy. At the same time, the overvoltage diode D3 / PSBD1DF40V1H is also forward-conducted and can absorb a maximum of 40W surge energy. The 0.8-meter-long USB charging cable and the self-recovery fuse F1 / 24V / 0.5A have a certain buffering effect on the surge voltage. In summary, after the measured -320V / 5-second surge impact, no components of this circuit are damaged, protecting the safety of the battery and subsequent related circuits.The input terminal of the DC-DC boost circuit U5 is connected to the battery VBAT. After being boosted to +5V by the boost circuit, it is output to the air pump circuit module to power the air pump circuit module. The LDO 3.0V voltage regulator circuit U4 outputs +3.0V to power the main control circuit module, and at the same time divides a +3.0V channel to power the camera circuit module.

[0019] Example 2: Based on Example 1: Figure 2-4 The battery BT1 is also connected to the main control circuit module, which includes the main control chip U1, the program storage chip U2, the crystal oscillator Y1, the status indicator lights D2, D3, D4, LED_G, LED_R, the RF antenna E1, and the filter capacitors C20, C25, and C30. The main control chip U1 is respectively connected to the program storage chip U2, the crystal oscillator Y1, the status indicator lights D2, D3, D4, LED_G, LED_R, the RF antenna E1, and the filter capacitors C20, C25, and C30. The main control chip U1 is responsible for processing the image signal from the camera circuit module, and converting and encoding it into a standard WIFI protocol RF signal, which is transmitted through the antenna E1. When the WIFI connection with the mobile phone is successful, the image can be viewed by clicking the corresponding APP on the mobile phone.

[0020] The DC-DC boost chip U5 is also connected to the camera module circuit, which includes a camera sensor J2, a lighting LED, a transistor Q1, a MOS tube Q2, a data bus SEN0_D2 to SEN0_D9, and control buses SEN0_VSYN, SEN0_PCLK, SEN0_PWDN, SEN0_MCLK, SEN0_SDA, and SEN0_SCL. The camera sensor J2 is connected to the drain of the MOS tube Q2 through a resistor R13, the gate of the MOS tube Q2 is connected to a resistor R21 and the collector of the transistor Q1, the base of the transistor Q1 is connected to a resistor R22 and a resistor R34, and the other end of the resistor R34 is connected to the lighting LED. The camera sensor J2 captures external images and transmits them to the main control circuit module through data buses SEN0_D2 to SEN0_D9, and the main control circuit module performs further processing. The camera sensor J2 is connected to the main control circuit module through control buses SEN0_VSYN, SEN0_PCLK, SEN0_PWDN, SEN0_MCLK, SEN0_SDA, and SEN0_SCL, and is controlled by the main control circuit module.

[0021] The voltage stabilizing circuit U4 is also connected to the air pump circuit module, which includes a MOS tube Q3, a diode D5, a capacitor C19, resistors R2, R3 and a motor J1. The gate of the MOS tube Q3 is connected to resistors R2 and R3, the other end of the resistor R2 is connected to the main control chip U1, the other point of the resistor R3 is grounded, the source of the MOS tube Q3 is grounded, the drain of the MOS tube Q3 is connected to the anode of the diode D5, the capacitor C19 and the motor J1, and the cathode of the diode D5 is connected to the other end of the capacitor C19 and the other end of the motor J1. When the system is in the power-on state, this circuit receives a control signal MOTO_CTL from the main control circuit module. When MOTO_CTL is high, the N-MOS tube Q3 is turned on, and a voltage close to 5V is generated at both ends of the motor J1 to start the motor. After the motor is started, the motor shaft is connected to the mechanical components related to the air pump, forcing the suction nozzle to generate negative pressure for sucking blackheads.

[0022] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0023] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A network transmission and access equipment surge protection circuit, a visual blackhead removal device, the network transmission and access equipment surge protection circuit comprises a charging input circuit J4, a diode T6, a diode D3, an overvoltage protection chip U6, a chip with overvoltage protection U3, a DC-DC boost chip U5 and a voltage stabilizing circuit U4, characterized in that: The port VBUS2 of the charging input circuit J4 is connected to the cathode of the diode T6, the cathode of the diode D3, the capacitor C55 and the pin 3 of the chip U6 through the fuse F1, the pin 4 of the chip U6 is connected to the resistor R39 and the pin 4 of the chip U3 with overvoltage protection, the other end of the resistor R39 is connected to the resistor R40 and the capacitor C8, the other end of the capacitor C8 is connected to the other end of the resistor R40, the pin 5 of the chip U3 with overvoltage protection is connected to the capacitor C11, the capacitor C69, the pin 5 of the DC-DC boost chip U5, the pin 1 of the voltage stabilizing circuit U4 and the positive electrode of the battery BT1, the negative electrode of the battery BT1 is connected to the other end of the capacitor C69, the other end of the capacitor C11 and the ground, the diode T6 is an overvoltage protection diode, and the diode D3 is an overvoltage protection diode; The battery BT1 is also connected to the main control circuit module, which includes a main control chip U1, a program storage chip U2, a crystal oscillator Y1, status indicator lights D2, D3, D4, LED_G, LED_R, a radio frequency antenna E1, and filter capacitors C2, C5, and C3. The main control chip U1 is respectively connected to the program storage chip U2, the crystal oscillator Y1, the status indicator lights D2, D3, D4, LED_G, LED_R, the radio frequency antenna E1, and the filter capacitors C2, C5, and C3; The DC-DC boost chip U5 is also connected to the camera module circuit, which includes a camera sensor J2, a lighting LED, a transistor Q1, a MOS tube Q2, a data bus SEN0_D2 to SEN0_D9, and a control bus SEN0_VSYN, SEN0_PCLK, SEN0_PWDN, SEN0_MCLK, SEN0_SDA, and SEN0_SCL. The camera sensor J2 is connected to the drain of the MOS tube Q2 through a resistor R13, the gate of the MOS tube Q2 is connected to a resistor R21 and a collector of the transistor Q1, the base of the transistor Q1 is connected to a resistor R22 and a resistor R34, and the other end of the resistor R34 is connected to the lighting LED. The camera module circuit is connected to the main control circuit module and receives control from the main control circuit module; The voltage stabilizing circuit U4 is also connected to an air pump circuit module, which includes a MOS tube Q3, a diode D5, a capacitor C19, resistors R2, R3 and a motor J1. The gate of the MOS tube Q3 is connected to resistors R2 and R3, the other end of the resistor R2 is connected to the main control chip U1, the other point of the resistor R3 is grounded, the source of the MOS tube Q3 is grounded, the drain of the MOS tube Q3 is connected to the anode of the diode D5, the capacitor C19 and the motor J1, the cathode of the diode D5 is connected to the other end of the capacitor C19 and the other end of the motor J1, and the air pump circuit module receives a control signal MOTO_CTL from the main control circuit module.

2. A network transmission and access equipment surge protection circuit according to claim 1, characterized in that: The DC-DC boost chip U5 outputs +5V DC power, and the voltage stabilizing circuit U4 outputs +3.0V DC power.

3. A network transmission and access equipment surge protection circuit according to claim 2, characterized in that: The MOS tube Q3 is an N-MOS tube.

4. A network transmission and access equipment surge protection circuit according to claim 3, characterized in that: The transistor Q1 is an NPN transistor.

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