Power supply surge suppressor

Abstract

The utility model discloses a power supply surge suppressor comprising a PCB, the PCB is provided with a power supply input end and a power supply output end, and the PCB is provided with a power supply relay control switch circuit, a voltage stabilizing circuit, a signal amplification circuit and an MOS tube control circuit; the power supply input end is connected with the voltage stabilizing circuit through the power supply relay control switch circuit, and the output end of the signal amplification circuit is connected with the MOS tube control circuit; and the output end of the MOS tube control circuit is connected with the power supply relay control switch circuit. According to the utility model, the structure arrangement is reasonable, and through the arrangement of the power supply relay control switch circuit and the signal amplification circuit, when the input end has large surge fluctuation, the amplification circuit realizes signal amplification and controls the power supply relay control switch circuit to be closed, so that the output end of the voltage stabilizing circuit is connected with a ground wire; the influence of surge fluctuation on a subsequent circuit can be avoided, and the stability and reliability of the whole circuit in use can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of surge suppression, and in particular relates to a power surge suppressor. Background Art

[0002] When the circuit is in contact or disconnected, it is often easy to generate a very high operating overvoltage. This voltage is called surge voltage, which is a kind of transient interference. Under normal circumstances, it will generate a surge voltage several times higher than the rated voltage, which will endanger the safe operation of the equipment and affect the stability of the output signal of the equipment. In most cases, it will also damage the circuit and its components. Therefore, eliminating surge noise is a key issue for the safe and reliable operation of the equipment.

[0003] In the prior art, most of them use varistors in conjunction with fuses for protection. When the line induces or generates a surge voltage, the varistor and the fuse work together to cause the supply equipment to produce a short-term power-off protection, thereby achieving the purpose of protecting electrical equipment. Although it can achieve surge protection, the stability of its protection is limited, and the fuse needs to be replaced after it blows, which will also affect the convenience of use, so its applicability and practicality are limited. Utility Model Content

[0004] The utility model aims to provide a power surge suppressor which has a reasonable structure and is conducive to improving the stability of use.

[0005] The technical solution to achieve the purpose of the utility model is a power surge suppressor, comprising a PCB board, on which a power input terminal and a power output terminal are arranged, and on which a power relay control switch circuit, a voltage stabilizing circuit, a signal amplifying circuit and a MOS tube control circuit are arranged;

[0006] The positive and negative electrodes of the power input terminal are connected to the power relay control switch circuit, and the output terminal of the power relay control switch circuit is connected to the voltage stabilizing circuit;

[0007] The output end of the voltage stabilizing circuit is electrically connected to the signal amplifying circuit;

[0008] The output end of the signal amplifying circuit is connected to the MOS tube control circuit;

[0009] The output end of the MOS tube control circuit is connected to the power supply relay control switch circuit.

[0010] It is further preferred that: the power supply relay control switch circuit comprises a relay, a ceramic gas discharge tube, a first fuse, a second fuse, a first variable resistor, a second variable resistor and a switch tube;

[0011] The input end of the ceramic gas discharge tube is connected to the ground end of the power input end, and the output end of the ceramic gas discharge tube is connected to the fifth pin of the switch tube after being connected in series with a second variable resistor;

[0012] The second fuse is connected between the negative electrode of the power input terminal and the fifth pin of the switch tube;

[0013] The first variable resistor is connected to the positive electrode of the power input terminal through the first fuse, and the other end of the first variable resistor is connected to the fifth pin of the switch tube;

[0014] The first pin of the switch tube is connected to a voltage stabilizing circuit;

[0015] The fourth pin of the switch tube is connected to the output end of the MOS tube control circuit.

[0016] It is further preferred that: the voltage stabilizing circuit comprises a first voltage stabilizing diode, a second voltage stabilizing diode and a fifteenth resistor;

[0017] The first voltage stabilizing diode and the second voltage stabilizing diode are connected in parallel, and the anodes of both are connected to the negative electrode of the output terminal of the relay;

[0018] The fifteenth resistor is connected in series between the cathodes of the first zener diode and the second zener diode, and the cathode of the second zener diode is connected to the first pin of the switch tube and the positive output terminal of the relay, and the cathode of the first zener diode is connected to the signal amplification circuit.

[0019] Further preferably, an indicator light circuit is provided at the output end of the relay.

[0020] The utility model has positive effects: the structure of the utility model is reasonably set up. By setting the power relay control switch circuit and the signal amplification circuit, when there is a large surge fluctuation at the input end, the amplification circuit realizes signal amplification to ensure that the signal will not be lost due to attenuation during the transmission process, and controls the power relay control switch circuit to be closed, so that the output end of the voltage stabilization circuit is connected to the ground wire, which can avoid the influence of surge fluctuations on subsequent circuits, is conducive to improving the stability and reliability of the overall circuit use, and has strong applicability and good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the content of the utility model easier to understand, the utility model is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein:

[0022] Figure 1 It is a schematic diagram of a circuit board of the utility model;

[0023] Figure 2 It is a schematic diagram of the assembly structure of local electronic components on the circuit board of the utility model;

[0024] Figure 3 It is a specific circuit diagram of the utility model.

[0025] Figure numerals: PCB board 1, power input terminal 2, power output terminal 3, indicator light circuit 4, power relay control switch circuit 5, voltage stabilizing circuit 6, signal amplifying circuit 7, MOS tube control circuit 8. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Example

[0028] See Figures 1 to 3 As shown, a power surge suppressor includes a PCB board 1, on which a power input terminal 2 and a power output terminal 3 are arranged, and on which a power relay control switch circuit 5, a voltage stabilizing circuit 6, a signal amplifying circuit 7 and a MOS tube control circuit 8 are arranged; in this embodiment, the power input terminal and the power output terminal are conventional structures of the prior art, so they are not described in detail, and when connected, the positive and negative electrodes of the power input terminal are connected to the relay DB1 in the power relay control switch circuit, the power input terminal is connected to the voltage stabilizing circuit through the power relay control switch circuit, and the output terminal of the voltage stabilizing circuit is electrically connected to the signal amplifying circuit; the output terminal of the signal amplifying circuit is connected to the MOS tube control circuit; the output terminal of the MOS tube control circuit is connected to the power relay control switch circuit. When in use, when there is a surge signal at the power input terminal, the signal amplifying circuit amplifies the signal, and controls the power relay control switch circuit through the MOS tube control circuit, so that the output terminal of the voltage stabilizing circuit is connected to the ground terminal, thereby avoiding the impact of the surge signal on the subsequent circuit and improving the stability and reliability of use.

[0029] In actual application, the power relay control switch circuit includes a relay DB1, a ceramic gas discharge tube GDT1, a first fuse F1, a second fuse F2, a first variable resistor MOV1, a second variable resistor MOV2 and a switch tube K1; during assembly, the input end of the ceramic gas discharge tube GDT1 is connected to the ground end of the power input end, and the output end of the ceramic gas discharge tube GDT1 is connected to the fifth pin of the switch tube K1 after being connected in series with the second variable resistor MOV2; the second fuse F2 is connected between the negative electrode of the power input end and the fifth pin of the switch tube K1; the first variable resistor MOV1 is connected to the positive electrode of the power input end through the first fuse F1, and the other end of the first variable resistor MOV1 is connected to the fifth pin of the switch tube K1; the first pin of the switch tube is connected to the voltage stabilizing circuit; the fourth pin of the switch tube is connected to the output end of the MOS tube control circuit.

[0030] When a surge signal appears, the signal amplification circuit amplifies the signal. The working principle of the ceramic gas discharge tube GDT1 is that when the external voltage increases to exceed the insulation strength of the gas, the gap between the two poles will discharge and break down, and the original insulation state will be converted into a conductive state. Therefore, the signal amplification circuit controls the conduction of the ceramic gas discharge tube through the MOS tube control circuit, and connects the output end of the voltage stabilization circuit to the ground wire, thereby preventing the surge from affecting the subsequent circuit.

[0031] And in the actual application process, the voltage stabilizing circuit includes a first voltage stabilizing diode ZD1, a second voltage stabilizing diode ZD2 and a fifteenth resistor R15; during assembly, the first voltage stabilizing diode ZD1 and the second voltage stabilizing diode ZD2 are connected in parallel, and the anodes are both connected to the negative electrode of the output terminal of the relay DB1; the fifteenth resistor is connected in series between the cathodes of the first voltage stabilizing diode ZD1 and the second voltage stabilizing diode ZD2, and the cathode of the second voltage stabilizing diode ZD2 is connected to the first pin of the switch tube and the positive electrode of the output terminal of the relay DB1, and the cathode of the first voltage stabilizing diode ZD1 is connected to the signal amplification circuit. The above circuit is mainly used to provide a stable voltage to the signal amplification circuit to ensure that the signal amplification circuit works smoothly and reliably.

[0032] In actual application, the output end of the relay DB1 is provided with an indicator light circuit 4 for easy indication.

[0033] The utility model has positive effects: the structure of the utility model is reasonably set up. By setting the power relay control switch circuit and the signal amplification circuit, when there is a large surge fluctuation at the input end, the amplification circuit realizes signal amplification to ensure that the signal will not be lost due to attenuation during the transmission process, and controls the power relay control switch circuit to be closed, so that the output end of the voltage stabilization circuit is connected to the ground wire, which can avoid the influence of surge fluctuations on subsequent circuits, is conducive to improving the stability and reliability of the overall circuit use, and has strong applicability and good practicality.

[0034] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification can also be directly processed according to existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0035] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still belong to the protection scope of the present invention.

Claims

1. A power surge suppressor, comprising a PCB board, wherein the PCB board is provided with a power input terminal and a power output terminal, wherein: The PCB board is provided with a power relay control switch circuit, a voltage stabilizing circuit, a signal amplifying circuit and a MOS tube control circuit; The positive and negative electrodes of the power input terminal are connected to the power relay control switch circuit, and the output terminal of the power relay control switch circuit is connected to the voltage stabilizing circuit; The output end of the voltage stabilizing circuit is electrically connected to the signal amplifying circuit; The output end of the signal amplifying circuit is connected to the MOS tube control circuit; The output end of the MOS tube control circuit is connected to the power supply relay control switch circuit.

2. A power surge suppressor according to claim 1, characterized in that: The power supply relay control switch circuit comprises a relay, a ceramic gas discharge tube, a first fuse, a second fuse, a first variable resistor, a second variable resistor and a switch tube; The input end of the ceramic gas discharge tube is connected to the ground end of the power input end, and the output end of the ceramic gas discharge tube is connected to the fifth pin of the switch tube after being connected in series with a second variable resistor; The second fuse is connected between the negative electrode of the power input terminal and the fifth pin of the switch tube; The first variable resistor is connected to the positive electrode of the power input terminal through the first fuse, and the other end of the first variable resistor is connected to the fifth pin of the switch tube; The first pin of the switch tube is connected to a voltage stabilizing circuit; The fourth pin of the switch tube is connected to the output end of the MOS tube control circuit.

3. A power surge suppressor according to claim 2, characterized in that: The voltage stabilizing circuit includes a first voltage stabilizing diode, a second voltage stabilizing diode and a fifteenth resistor; The first voltage stabilizing diode and the second voltage stabilizing diode are connected in parallel, and the anodes of both are connected to the negative electrode of the output terminal of the relay; The fifteenth resistor is connected in series between the cathodes of the first zener diode and the second zener diode, and the cathode of the second zener diode is connected to the first pin of the switch tube and the positive output terminal of the relay, and the cathode of the first zener diode is connected to the signal amplification circuit.

4. A power surge suppressor according to claim 3, characterized in that: The output end of the relay is provided with an indicator light circuit.

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