CN217362571U

CN217362571U - Surge protection device of low pressure drop DC output

Info

Publication number: CN217362571U
Application number: CN202220506008.5U
Authority: CN
Inventors: 张耀平; 王希永; 柏方泉; 曹德参
Original assignee: Zhiyang Innovation Technology Co Ltd
Current assignee: Zhiyang Innovation Technology Co Ltd
Priority date: 2022-03-09
Filing date: 2022-03-09
Publication date: 2022-09-02
Anticipated expiration: 2032-03-09

Abstract

The utility model relates to a surge protector of low pressure drop DC output, including supply terminal, control module, switch module, protection module and output. The power supply end is a DC output power supply. And the control module is used for controlling the on-off of the switch module. And the switch module is used for controlling the output of the power supply and performing reverse voltage loss prevention. And the protection module is used for performing surge protection. The output end is a power output end and is used for providing power for an external load. The utility model can effectively prevent the surge from being injected into the equipment through the power output port of the equipment, and avoid the damage of the equipment components caused by overvoltage and overcurrent; and the energy utilization rate of the equipment can be improved, and the voltage supply power and the heat loss of the equipment are reduced.

Description

Surge protection device of low pressure drop DC output

Technical Field

The utility model relates to a transmission line detects technical field, concretely relates to surge protector of low pressure drop DC output.

Background

With the continuous development of digital technology, the internal structure of electronic devices is highly integrated (VLSI chip). The high integration leads to the level reduction of withstand voltage and over-current resistance of the equipment, so that the chip is more sensitive to voltage fluctuation, and once the equipment receives the interference of surge signals or voltage in the equipment is subjected to voltage transient due to inductive impedance, the chip is easy to be damaged irreversibly. Severe transmission line environment, complex climate and other factors have stricter requirements on the reliability of power transmission products. Meanwhile, the low power consumption performance of the equipment is particularly important under the special solar power supply environment condition of a power transmission product. The existing switch type surge protection device has the advantages of more used components, high cost, larger influence on the protection effect by the reliability of an IC chip and single application scene.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a surge protector of low pressure drop DC output, this surge protector can solve the problem that the voltage loss of the existing DC output end protector is not enough, can prevent effectively that the surge from pouring into the equipment through the equipment power supply outlet, avoid overvoltage, overcurrent to lead to the equipment components and parts to take place the damage such as short circuit, open circuit; and the circuit does not need to be connected with a diode in series, so that the equipment power consumption loss caused by the voltage drop of the diode does not exist, the energy utilization rate of the equipment can be improved, the voltage supply power of a battery and the heat loss of the equipment in a solar power supply scheme are reduced, and unnecessary energy waste is avoided.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a surge protection device for low-voltage drop DC output comprises a power supply end, a control module, a switch module, a protection module and a power supply output end.

The power supply end is a DC output power supply.

And the control module is used for controlling the on-off of the switch module.

And the switch module is used for controlling the output of the power supply and performing reverse voltage loss prevention.

And the protection module is used for performing surge protection.

And the power supply output end is used for supplying power to an external load.

Furthermore, the output end of the power supply end is connected with the input end of the switch module, the output end of the control module is connected with the input end of the switch module, the output end of the switch module is connected with the input end of the protection module, and the output end of the protection module is connected with the output end of the power supply.

Further, the control module comprises a resistor R1; the switch module comprises a transistor Q1, a transistor Q2, a resistor R2 and a resistor R3; the protection module comprises a diode D1, a capacitor C1, a capacitor C2, a capacitor C3 and an inductor L1. And the cathode of the diode D1 is the input end of the protection module. One end of the resistor R1 is connected with a control signal, the other end of the resistor R1 is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with a power supply; the source and the gate of the transistor Q1 are respectively connected with two ends of a resistor R2, the drain of the transistor Q1 is connected with the drain of the transistor Q2, and the gates of the transistor Q1 and the transistor Q2 are respectively connected with two ends of a resistor R3; the grid of transistor Q2 is through electric capacity C3 ground connection, and the grid of transistor still connects diode D1's negative pole through inductance L1, diode D1's positive pole ground connection, negative pole connection power output end, electric capacity C1 and electric capacity C2 connect the back in parallel, and one end ground connection, another termination power output end.

Further, the transistor Q1 adopts a MOS transistor.

Further, the transistor Q2 adopts a MOS transistor.

Further, the diode D1 is a TVS tube.

Further, the inductor L1 adopts a differential mode inductor.

Further, the other end of the capacitor C2 is used as a power output terminal for providing power for an external load.

According to the technical scheme provided by the utility model, the utility model discloses can solve the not enough problem of voltage loss that current DC output protector exists, can prevent effectively that the surge from pouring into inside the equipment through equipment power delivery outlet, avoid excessive pressure, overflow and lead to equipment components and parts to take place damages such as short circuit, open circuit. And the protective device does not need to be connected with a diode in series, so that the equipment power consumption loss caused by the voltage drop of the diode does not exist, the energy utilization rate of the equipment can be improved, the voltage supply power of a battery and the heat loss of the equipment in a solar power supply scheme are reduced, and unnecessary energy waste is avoided.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention;

fig. 2 is a circuit diagram of the surge protection device for low-voltage drop DC output according to the present invention.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

the surge protection device for low-voltage drop DC output shown in FIG. 1 comprises a power supply terminal 1, a control module 5, a switch module 2, a protection module 3 and a power output terminal 4. The output end of the power supply end 1 is connected with the input end of the switch module 2, the output end of the control module 5 is connected with the input end of the switch module 2, the output end of the switch module 2 is connected with the input end of the protection module 3, and the output end of the protection module 3 is connected with the power output end 4.

Specifically, the power supply terminal 1 is a DC output power supply. And the control module 5 is used for controlling the on-off of the switch module. And the switch module 2 is used for controlling power supply output and performing reverse voltage loss prevention. And the protection module 3 is used for performing surge protection. And the power output end 4 is used for providing power for an external load.

As shown in fig. 2, the control module 5 includes a resistor R1. The switch module 2 includes a transistor Q1, a transistor Q2, a resistor R2, and a resistor R3. The protection module 3 comprises a diode D1, a capacitor C1, a capacitor C2, a capacitor C3 and an inductor L1. The resistor R1 and the resistor R3 are current limiting resistors, and the resistor R2 is a pull-up resistor. Transistor Q1 and transistor Q2 are both DC power supply output control switches. The capacitor C1, the capacitor C2 and the capacitor C3 are all filter capacitors. Diode D1 is a voltage clamp TVS. The inductor L2 is a decoupling inductor. One end of the resistor R1 is connected with the MCU control signal, the other end is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with the power supply. The power supply is a DC output power supply. The source and the gate of the transistor Q1 are respectively connected with two ends of a resistor R2, the drain of the transistor Q1 is connected with the drain of the transistor Q2, and the gates of the transistor Q1 and the transistor Q2 are respectively connected with two ends of a resistor R3. The anode of the diode D1 is connected with one end of the capacitor C1 and one end of the capacitor C2 respectively and then is grounded, and the cathode of the diode D1 is connected with the other end of the capacitor C1, the other end of the capacitor C2 and the inductor L1 respectively; the other end of the inductor L1 is also connected to the capacitor C3 and the source of the transistor Q2. The MCU control signal is used for controlling the MOS tube to be switched on and off.

Further, the transistor Q1 adopts a MOS transistor.

Further, the transistor Q2 adopts a MOS transistor.

Further, the diode D1 is a TVS tube.

Further, the inductor L1 adopts a differential mode inductor.

The utility model discloses a theory of operation does:

surge protector adopt two kinds of safeguard procedures to carry out the surge protection:

measure 1: when the DC external power supply is not used, the control signal Ctrl cuts off the surge interference injection channel by controlling and turning off the transistor Q1 and the transistor Q2, thereby protecting a rear-stage circuit.

And 2, measure 2: when negative surge is injected, because the diode D1 has a one-way conduction characteristic, surge energy is discharged through a diode D1 path; when a forward surge is injected, the capacitor C1 and the capacitor C3 absorb part of surge energy released by the capacitors, and the clamping characteristic of the TVS diode D1 enables the surge energy to be discharged so as to ensure that the voltage at two ends of the diode D1 is kept in a certain range. Meanwhile, the inductor L1 and the capacitor C3 further release surge residual energy to ensure that the subsequent stage circuit works normally.

The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.

Claims

1. A surge protection device of low pressure drop DC output which characterized in that: the protection device comprises a power supply end, a control module, a switch module, a protection module and a power supply output end;

the power supply end is a DC output power supply; the control module is used for controlling the on-off of the switch module; the switch module is used for controlling power supply output and performing reverse voltage loss prevention; the protection module is used for carrying out surge protection; the power supply output end is used for providing power supply for an external load;

the output end of the power supply end is connected with the input end of the switch module, the output end of the control module is connected with the input end of the switch module, the output end of the switch module is connected with the input end of the protection module, and the output end of the protection module is connected with the output end of the power supply;

the protection module comprises a diode D1, a capacitor C1, a capacitor C2, a capacitor C3 and an inductor L1; the cathode of the diode D1 is the input end of the protection module; the anode of the diode D1 is grounded, and the cathode of the diode D1 is connected with the output end of the power supply; and after the capacitor C1 is connected with the capacitor C2 in parallel, one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected with the output end of the power supply.

2. The surge protection device for low drop-out DC output of claim 1, wherein: the control module includes a resistor R1; the switch module comprises a transistor Q1, a transistor Q2, a resistor R2 and a resistor R3; one end of the resistor R1 is connected with a control signal, the other end of the resistor R2 is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with a DC output power supply; the source and the gate of the transistor Q1 are respectively connected with two ends of a resistor R2, the drain of the transistor Q1 is connected with the drain of the transistor Q2, and the gates of the transistor Q1 and the transistor Q2 are respectively connected with two ends of a resistor R3; the gate of the transistor Q2 is grounded via a capacitor C3, and the gate of the transistor Q2 is further connected to the cathode of a diode D1 via an inductor L1.

3. The surge protection device for low drop-out DC output of claim 2, wherein: the transistor Q1 adopts a MOS transistor.

4. The surge protection device for low drop-out DC output of claim 2, wherein: the transistor Q2 adopts a MOS transistor.

5. A low drop-out DC output surge protection device as claimed in claim 2, wherein: the diode D1 adopts a TVS tube.

6. A low drop-out DC output surge protection device as claimed in claim 2, wherein: the inductance L1 is a differential mode inductance.

7. A low drop-out DC output surge protection device as claimed in claim 1, wherein: the other end of the capacitor C2 is connected with the output end of the power supply.